So you telling me that as a sales person you have never had a situation where a customer comes and asks you if x camera is good for the price or y camera ?
P.s:- English is not my first language so maybe I used the word in a wrong way. However you could had simply written to replace the word guilt with regret or wiser purchase without going to illegal money, shutup etc.
I don't see how my answering THAT question goes to a resolution of your original post. Nor do I see it as my place to correct your language usage just to make your post seem less judgemental of your friend's motives.
Asking a sales "assistant" (in other words, a qualified, trained and knowledgeable sales person) whether one component is "good for the price" has two distinctions in this particular matter.
The first is, asking such a question implies no guilt on the part of the buyer or the seller.
Second, no sales person is likely to directly answer such a question. A sales person only facilitates the process, they do not complete the process for the client.
A good salesperson's job is to facilitate; to lead the client through the sales process and to direct - through a series of steps - a business transaction toward a (satisfying to both parties) conclusion. Sales is a process, a process which hopefully narrows the decisions for the client to an acceptable few. Though some sales personnel treat it otherwise, no sales person is there to say, "Buy this or else". There is an early stage of the sales process known as "qualifying the client". Ideally, this is time spent discussing the priorities, the needs and the desires of the prospective buyer. It is not the time when the sales person goes to the stock room to check what they need to sell that day.
During the qualifying stage, the sales person is attempting to make it a bit more obvious to the client what it is they might want/need as well as making it more certain to the sales person what they do have in their stock which might best suit the client's stated desires. So, had I been asked the question, " ... if x camera is good for the price or y camera", there would be no answer I could provide which I could stand behind until I knew more about the client and their history with equipment and their future possible uses of their equipment. That actually is a fairly short answer to your question. The shortest answer is, it's not the sales person's job to say which is better, that's why the store will have a good supply of available products from which the client may select the most appropriate.
Your use of the word "guilty" may be due to your unfamiliarity with the English language. Yet, "guilt" implies someone has done something they should not have done. In one sense, it is a legal term which means you've broken the law. In another it can mean you've done something you should not have even considered. (There's a rather well known George Carlin comedy routine dealing with that peculiar brand of sin caused by "Catholic guilt".) That you have broken a trust and a bond may cause guilty feelings. It is a different level of feeling and responsibility which is distinct from regret or remorse.
Many buyers have the well known "buyer's remorse" the day after they have made a purchase. They may regret spending money that was ear-marked for another use. They may have remorse over buying on an impulse. They may find the product is not what they needed/desired or that it is not well suited to their situation. They now regret the purchase and have remorse for their impetuous nature.
Guilt however, is an entirely different breed of horse. Guilt is the thoroughbred of doing something wrong. It is the Triple Crown winner and the high priced stud of shameful actions. Judging one product more appropriate to your needs than another product does not enter into the same qualifying rounds with the truly "guilty".
Judgement is not the same as buying a product using money obtained through illegal or immoral actions. Or by breaking a trust that you shouldn't have made the purchase.
I was once presented a credit card with the name of a female card holder on the front. The "buyers" were two young teenaged boys who wanted an electronic component. I asked for ID from the two boys. When I questioned the card holder's name vs their appearance and the lack of a similar name on any document, I was told the card holder was their aunt and they were sent to buy the component for her. I said I would need her permission to complete the sale and in the process notified store security of the situation. The boys could not supply a contact number for their "aunt" and when security showed up at the front of the store, they ran. We contacted the credit card company and the card had just been reported as having been stolen/lost. To have simply completed the sale so I could receive a commission would have been a breach of trust between myself and my employer at the time. Both the boys and I would have been guilty of a misdemeanor/felony, though their crime would have been unlike my own. Either way, we all could have been judged "guilty" in a court of law.
I did, however, once sell an audio system to a couple using stolen money and stolen identities. The manager of the store OK'd the deal and we loaded the gear into their car. It wasn't until another few months had passed that the police notified the shop of the extent of their crime and our part in the process. There was no intent on the part of myself nor the manager to accept stolen money or to pass along stolen merchandise, so there was no crime and, therefore, no guilt on our part.
I have sold items to be used as a gift to another person in the buyer's family. Technically, that is called a "strawman purchase" and it can be illegal on both a state and Federal level. The family members supplied sufficient proof they were not attempting to skirt the law, just to keep the purchase a secret until they could surprise their relative. Once we were as certain as possible regarding the legality of the sale, we proceeded to assist the family members in their wish. Legal issues recognize there are circumstances where, say, a father buys a daughter a new car (without her name being on the title) or a son a new camera for the sake of being "family". No laws have been violated and no "guilt" has been assumed.
Broadly speaking, in legal terms, someone may be "guilty" of stealing money with which they purchased goods or used it for their own enrichment.
Someone may feel morally "guilty" when they have not rightfully earned the money they have used for a purchase.
Someone on a diet may feel remorse for eating three slices of pie.
Someone who has just finished off a large holiday meal may feel regret for having those last, additional two slices of pie.
I don't know if that helps you understand the English language any more completely, but assigning "guilt" to your friend's situation was, IMO, the wrong way to state your question if he is simply deciding which camera is best suited for his needs.
Hope that helps. Though I doubt this has much to do with your initial post.