There are lots of undesirable old rares. They are pretty hard to sell. As someone who sells a lot I have a pretty good grip on what moves quickly and what doesn't. But of course like you said there are lots of resellers that can't tell the difference because they aren't actually gamers. Every game needs to be pushed up in price! Max profit!
I don't know that we will ever see the good old games drop back down in price much. It's unfortunate because I'd like to get all the WD turbo games at some point. With some of my recent sales I'm definitely getting Sega Ages and Thunder Force V to fill out my post turbo set, but the trick with those is waiting for a decent listing to pop up. I will not pay more than $100 for Sega Ages CIB so it may take some time to get...