$5000 seems like a lot to you right now, but trust me, when you've spent two days of back-breaking work producing the goods and then another week or so fiddling with the damn product until it's just right, it seems too cheap!! That's about $100 per hour, which is fair for hiring someone with specialist knowledge.
Those kind of jobs only come around once a month or so even if you could do every one of them (location permitting!) it's not millionaire territory.
Others might charge less, but it's all in the results. I guarantee happiness or your money back. The whole thing project managed, start to finish with the client getting precisely what they have paid for - that's what people need to pay extra for.
I still suck at taking car pictures. Just don't get em for some reason. Give me a model and I'm happy though.
Rob