The wiki is your best bet, boomeranging is just making a profit off a game you bought at that venue. Ex: I bought a game from GameStop for 20 bucks got 21 in trade credit. Or bought 3 games on a b2g1 promo for 30 bucks and trade it in for 35. The sheets in the wiki post lay it out ina spread sheet. From there read gamestops website and do some math. It's still not easy for me but you'll get the hang of it. You'll ask some dumb questions (I do often as you'll read). Good luck!
I appreciate the help. I have looked at the wiki and also at the spreadsheet. I guess some general questions would be:
If I buy games from Gamestop A, should I always take them to Gamestop B to trade in?
If I set up a pre-order at Gamestop A to get a trade bump, do I have to trade my games in at Gamestop A only?
Do trade in values change daily? Weekly? Does it seem like there is a better time during the week to get the games in?
Are you guys flipping everything in the green on the spreadsheet? Or do you have a minimum profit you go for?