My needs and your needs need not be the same but over the years I've bought items I rarely use. Things that I feel/felt important to possess but having acquired a particular style of shooting I just have hanging about. 1) Tripod (oh my!) Yes I never use one. I own a Manfrotto and it's purty. 2) Monopod. Same as above! 3) Light meter. An expensive one! Even shooting strobes I never use it. It does all kinds of tricks too! 4) Cases and bags. OK I have a number that I bought to find the one that I really like. 5) A ton of memory cards. Good to have? I use one and carry a backup. Even my D810 can't fill it up! 6) Books I've never read, DVDs I should watch that I spent hundreds on! I'm sure there's more. How about you? Make any purchases that just sit around?