A lot of them are shit, unfortunately some of them like that one isn't. There's a reason when late last year I saw a craigslist post saying NES w/Super Mario Bros 3, Castlevania, Gradius, Bonk, 17 games - $50 that I clicked that sucker and called within 10min of it going up. Bonk has been a steady $60-70 type game so I jumped at it. I'd never pay that alone, just can't justify it on a budget, but when I can find stuff like that and there's a heap of pad I can turn around and make it free + profit I'm there.
Sadly that's what you and I got to do in cases like Snow Bros. I'd love a copy, but until I find some clueless thrift shop, flea market non-ebay pricer, or unknowing/caring craigslister it's off my list so I don't let it bug me.
If they were in that $10-20 range I'd have kept(had it) Duck Tales 2, but also got Rescue Rangers 2, Snow Bros, Dragon Warrior 3 and 4, and some other high ball titles as they are good. I've kind of given up, at this rate I'm going for a powerpak as it's cheaper in the long run, but if I ever do stumble on a gem cheap it's mine.