It's good at first...but if you really think about it. Unless your games are old, old games then your losing a lot of money.
OK, so you trade in 5 semi-recent releases and get a shiny new waiting-to-be-opened game. You get it for free. GAME get 5 games for the price of 1 game. If these games are quite recent they'll sell them on at 15 quid a pop. That's £75!(I'm a genius *cough*)
So Game get a tasty profit of £45 and you lose 5 games for one, which, unless its Pro Evo 4, GTA San Andreas or GT4 it wont last long.
.:.Bonzo.:.