Any of this sort of "collector" stuff is like stocks: you don't loose a dime unless you sell for less than yoiur investment.
If you are in it for the money, you need to understand the market, and ride the waves.
I'm in it for the drums, and always looking to find that piece or drum to scratch an itch. I got a nice Sonor snare a couple years ago, made it beautiful, tuned it up, and decided it wasn't for me in about a half hour. I turned it around and broke even on it. Maybe I could have priced it higher, and sat on it for a few months (or longer) but that's not what it's all about for me.
Like most guys on here, I'd rather give a drum to a needy kid who wants to learn, but doesn't have the means to get one, than to deal with the poopie-heads on eBay.