Although I am not a serious collector (nor do I play one on TV), I look for the following:
Is it shootable? I only collect (accumulate) what I can shoot. (that makes them only right-handed for me) No aluminum lams, doglegs, compass Kodiaks, or bowrack queens.
Along with the above, what is the finish/condition? It doesn't have to be perfect by any means, but it should be original and not need to be completely stripped and refinished in order to be used, mostly because I can't afford to send them off, and couldn't do the excellent kind of work that bowdoc and droptine are capable of. Touch-ups and a coat of wax are OK.
If it needed to be sold, could I get out of it what I paid for it? (Within reason, I don't mind loosing a few dollars as the price of admission, but 50% of what it cost me might be too much of a loss for me)
I lean toward 40-60 pound, right-hand, early (1950's early 1960's era, for the same reasons as droptine), longbow/semi-recurve rather than full recurve (although not exclusively). I just like the looks of the old maple Bear bows.
I started out just wanting one Bear bow, as my wife grew up 15 miles from the factory in Grayling, but it just kinda grew and now I have 8. I keep my eye open for additions, but am not as eager to get "just one more" as I used to be.
RonP