[quote name='organicow'][quote name='gizmogc'][quote name='ElwoodCuse']In the store, you're in trouble. Outside the store, they can't do anything about it.[/quote]
Within a certain amount of feet they can. If your just waiting outside the door to see what people bring in, they can call the cops. Ive done it many times at my store. Its simply staling business from that store. Its like if you had abunch of DVDs, and sat outside Best Buy waiting for people to go in and say "Hellboy is $16.99 inside...$15.99 RIGHT here". Your taking away from there business and customers who may purchase somnething else.[/quote]
While I certainly see your point, I would argue that there is a difference between the two scenarios here. If you stand outside of EB and give customers money, you are not taking money away from the store as directly as you would were you to sell DVDs outside BB. Still, I do see your point.
Also, I would say that a good portion of the times that people trade in games at EB, they are looking to get new games - so they are likely wanting trade-in credit. *if any EB or GS employees want to correct me, that's cool.* So theoretically, if you were to give someone outside $30 for 3 games instead of the $12 that the store would have given them, that's just more money that that person can spend inside the store. Make sense?
^^Just a thought.

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You missed a step in your logic there. Follow along:
Scenario A.
1. Customer trades in games and gets $12 in credit.
2. Customer buys new game priced at $50, giving back the $12 in credit and $38 cash.
3. Retailer then sells traded-in games at normal markup for roughly $95.
4. Retailer now has in hand $133 and is missing one new game.
Scenario B.
1. You purchase said games for $30 from customer.
2. Customer purchases new game priced at $50, giving the retailer your $30 and $20 of their own.
3. Retailer now has in hand $50 and is missing one new game.
See the difference?