Woot, picked up Tomba, Jumping Flash, Parasite Eve, Xenogears, and Mega Man 10 unlock. Was tempted to get DA: Inquisition, but feel it's going to be a PS+ 'free' game relatively soon.
I don't think so if you have enough credit to cover the full amount (at least in TX). I traded my games straight up for Splatoon and wasn't charged tax (so 59.99 worth of credit). I would imagine it makes no difference for a pre-order.
It's all relative man. I buy maybe 1-2 modern games per year nowadays (i play retro games). Scaling back old beaten-up games I've been sitting on for decent trade-in values I didn't think I could get and the space savings in the shelving was totally worth it. I'm not one who likes to play...
Not too shabby, $90 trade in credit:
AC: New Leaf 3DS $20 (paid $20 2 years ago)
KH Dream Drop Distance 3DS $25 (paid $20 2 years ago)
LoZ Twilight Princess Wii $20
MK Komplete Edition PS3 $12.50 (paid $10 2 years ago)
Kirby Super Star Ultra DS ...
I bet it's super awkward standing in a GS right now with the computers all down and you can't help but notice that little 'new releases' shelf above the GS employee's head or better yet being heckled by the GS employee to see whether you need to pre-order something while you wait LMAO.