You fail math forever.
I do notice some classic game stores aren't exactly the place for deals. There's one in my area that always charges significantly over Ebay for most things. They're super high, like $100 for a loose Dragon Warrior 3 high. I like to go in there and look around and all but, you know, I have a computer. I know where fleamarkets are. I can get most of their stuff easily for a quarter of the price, I just can't see paying as much as they're asking for it unless I have to. So I don't. Also, they do this thing where they "update" the prices but don't update the game on the shelf, so you'll take it to the register and find out it's a lot more than the sticker. That annoys me, I don't mind the updating the price but it shouldn't officially be updated until someone puts the new price on it.
Now, there's another guy, conveniently closer to me, who sells classic games. He isn't giving the stuff away but his prices are fair, usually a little lower than online, and you get a square deal from him. He sold me Dragon Warrior 3 loose for, I think it was about $15. No, it's not an amazing deal that would have people oohing an ahhing in the finds thread here, but it wasn't a ripoff either.
So simply saying "classic game stores suck" isn't fair, because they're not all like that.