I look at it like this. You can always afford to use a Busse. Sure, I could have sold this one for more than I paid. But the great thing about Busse knives is that I can enjoy it and then, on down the road, get durn close to what I paid if I want to sell it.
Some Busses I don't use because I've already filled a niche. I'll abuse the dickens out of my red G-10 Game Warden. It's definitely my favorite of the bunch. But as for the rest of the Wardens (excepting also one of my Skeleton Wardens, which I want to strip and use as a necker), I'll likely look at them, fondle them a bit, trade some, maybe sell some eventually to support another INFI fix.