Is it worth keeping or should I let my 360 and PS3 go for now while there still worth something? Or should I hang on to them maybe for collectible value 20-30 years down the road?
Never sell any of your games or consoles unless you're sure it's what you want. I traded five games into Gamestop and I've felt awful ever since. That piece of shit has a portion of my game collection that I'll never get back
You strapped for cash or something? There's absolutely no point selling your old hardware unless you need the money, and if you plan on spending it on a PS4/Xbone then you'd be an idiot since the 360/PS3 have a massive library that neither of those consoles can touch, all they'll have is crappy launch titles for full price.
Willingly trades in games > cries that gamestop is shit
Logic.
No one has it.