Gamestop is a place where you can trade in games and consoles for store credit
You can sell broken game consoles on auction sites like eBay.
Yes, if it is still in warranty, and you call microsoft. Give them a call at 1-800-4MYXBOX
yes you can
Look on ebay many people sell the broken xbox consoles
yes
Yes Play N Trade Fixes Game And Fixes Game Consoles.
You'll have to trade in games/consoles for cash/credit at the store you want it from. It's not just as simple as trading DS for DS.
about $20 for all consoles
No.
They are still being made because they are still selling consoles. The number of total consoles sold is over 150 million and there are over 1.5 billions games sold. As long as old broken or worn out consoles are replaced with new ones they will keep making the products
Broken hardware isn't worth much due to the repair cost - if the hardware is even repairable in the first place. No one is going to give you working game consoles for broken hardware.