I work in a vintage video game store part time.
1) "I paid $60 for this game! You're trying to rip me off!" - The reply I hear all the time whenever I tell people how much I'm willing to pay for a used copy of a newer release, and in some cases, for games that are several years old that sell for less than $10 used. My prices depend on demand, how many I have in stock, the condition, my competitors, and the price they go for online. I do my damnedest to give you an accurate price that's fair for both of us.
I help run an independent small business whose continued existence depends on the profits made on stock that others bring in to trade/sell - if you want the full price of the game, you can go through the hassle of selling it privately yourself. Have fun trying to find a buyer for Dora the Explorer for PS2. In the meantime, we have rent, employees, and taxes to pay, accessories and repair parts to order, along with special items for our regulars that cannot be found in your local Wal-Mart or EB Games.
2) "Why won't you take this? Just give me $10 for it and it's yours." - I don't want your garbage. I don't want your scratched up sports games that I would only sell for $1 each, and would have to spend $3 in materials to fix before I could do so. I don't want your cheap crappy accessories and plug-in-play systems that never sell and take up valuable space. I don't want your busted up controllers, broken consoles, corroded game cartridges, cracked discs, bootlegs, and other assorted filthy junk that would require a tetanus shot and several hours worth of labour to clean/repair.
Go to a recycling centre; they are there for a reason.
3) "Can I return this game/system? I didn't like it." - Fuck you. You want to rent games? Go to Gamefly. We have giant policy signs everywhere that say it, not to mention it says right on the receipt itself: exchange ONLY for defective product ONLY. I say the policy every single time I sell something to someone. You want to know what a game is like? Use the internet: at home, on your phone, at the library, at a Wi-Fi hotspot, etc. A big box store might put up with your entitled bullshit, but a small independent store like us can't afford to give you FREE rentals just because you are too incompetent to do your own research.