Wow woke the dead didn't ya? Been 13 months and it was my post. I'll say this much in that time frame. Other than 1 game in Sept 2013, I gave up buying old 8/16bit games actively July of that year. Since that time I've kept up on prices, but I've just grabbed famicom stuff, and gb/gbc/gba stuff (gb/c recently in the last month alone.) I went towards lego, manga, and straight up avoided 8/16bit Nintendo carts because of things and I'm happier for it. There are a few I've picked up since then but they've been local deals if I find them and there was the CIB Civilzation on SNES last year on this board and that's really it. Once you realize how bad it is, and you decide to stop playing into other peoples petty scalping games it gets a lot less stressful and more fun. You'll find there's plenty on the shelf to screw around with, and you'll find enough of it just sucks or isn't worth the time on a matter of taste, and that can be sold for better things, like my high end gaming laptop I got last December.
ebay isn't the problem, it's just a symptom of a bigger issue of non-gamers seeing dollar signs and hosing others over who don't know better or just don't care because they have something the buyer wants and they'll fight other like minded people into blowing money. Same reason with the retail shops, if there weren't enough suckers, they'd be forced to lower prices or go out of business too. Just accept it, grab anything that rarely pops up on a deal, give up, or take the beating, as there's no real other options.