These always come up when I never have anything to sell. Most people end up hauling a fuckton of credit, so it's great to capitalize on. While trade in values will naturally decrease as more product is brought in across the stores, you still end up on top most of the time.
Of course. I used to go to GameStop because of the convenience, but only very recently, I've been using eBay and having a good time. Got all of the money I spent on the No Man's Sky CE back because I took the time to make an ad! GameStop was the way I used to get games when I was younger and had no way of an income, so I do appreciate them existing!
Heres what you do, find games you want to trade in today, check the prices NOW.
Tomorrow check the prices again and see what changed and if its still worth it.
60% is the highest they've ever given on trades so I imagine that things will likely drop quite a bit but generally you still come out ahead by quite a bit... Some titles however don't drop at all and you get crazy amounts for, I remember when Brawl came out they did the 50% and it didn't drop from the 30$ base they were originally offering so I got 45$ for it.