I normally make a killing at garage sales, but that's because I'm the buyer.
Nobody at garage sales who know what they are looking for will be willing to pay up front for the actual value of the games, and the value of some of those games might be too high for some of the buyers who don't know what games are worth.
Now if you were talking about really cheap titles, like EA sports games and just junk like that, those are maybe the ones you can toss into the boxes at garage sales, because dumb people swarm to outdated EA games for older consoles for some odd reason, and those are the games that are hard to sell on here, so might as well, but nothing should be out there that's actually of any value.