I'm not a set collector. Sometimes I think I am and begin a set because I like the cards or issue that much. I once tried the 1918 Zeenuts (impossible) and P2 Sweet Cap Pins. I like both sets to the degree that one card won't satisfy and more than 5 is too much.
I've reconciled myself to the fact that I'm not a completist. I just don't need that satisfaction that comes from finishing a set. I'd much rather search out the next rare jewel and have the resources to pursue it.
I try to hold onto a few of the better condition or ones that I like the most if I ever stall on a set. Evidenced by a couple of P2s below.