Usually, I'll pass. If it's a rare game, and it's cheap then I'll buy just to resell it. I found Silent Hill disc only for $1, no reason to pass that up.
It's funny that we look at disc only with such disdain, but loose cartridge is seen as okay. Cartridges don't really display much better than discs, and they're quite unpleasant to look at as well. I suppose they're more secure, and more rugged. Disc art though, can sometimes be bland, or difficult to read.