How does GameStop make money off games?

Where do they get there new games and how do they profit from them?How does GameStop make money off games?
GameStop is a retail store, meaning they buy their game from manufacturers and retail them. They also have a service to buy used consoles/games/accessories from and sell those too.
They find order from product management and transfer to their warehouses and when ppl buy them they give less money for trade ins and sell a $10 they gave a guy AC 2 then sell it for $20 with syores everywhereHow does GameStop make money off games?
they get the games from the manufacturer for like 50$ and sell them back for 60$-70$
They pay 10 dollars for a used game and sell it for double or triple what they paid. Also warranties, cross selling and power cards premium membership.How does GameStop make money off games?
They purchase them from a wholesale distributor and mark them up to retail prices and sell them
Magic money machines in the back...
They grow opium in the back room.
You sell them Call of Duty: Black Ops for $20.00, they sell it for $45.00. Seems pretty straight-forward to me...
Buy low, sell high. Applies to both new and used games.
they dont