Hmm. Well, first I'd have to figure out what exactly is unnecessary. I assume this question means something extravagant and silly, like Jimi Hendrix's burned guitar or something and not like a new car or house.

Aaaannnddd... I can't think of anything. A castle in Scotland? No wait, I know! A yarn dyeing studio or a yarn shop. Is that cool? Probably not. But I'd always have access to the loveliest of yarns and could just spend my days floating between the shelves going "mmmmm, yaaarrrnnn...."

(Sorry, I didn't sleep last night.)