That doesn't make you a genius, just an asshole.
At a much different scale, consider warlords that sell intercepted donated food to the people it was meant to go to for free. They aren't geniuses, just massive assholes.
http://www.nypost.com/p/news/local/isle_take_that_welfare_sc...
No, it's not a soup kitchen. The point's the same. It's just people acting as parasites. Nothing brilliant about it.
Even if the TOS said you couldn't do this, it wouldn't make it illegal (in the US). The TOS is not law, and the only repercussions would be civil.
The only issue I see with that solution is, is the Genius Bar also there so advise people on which apple products to buy, hence new customers?
Also, it's not that brilliant, IMO. It is not unusual for secondary markets to spring up when the commodity is fungible and there is a supply constraint. See also: scalping sporting event and concert tickets; a practice that is also seen as a shiesty thing to do.
These scalpers are making it impossible for anyone to book a Genius Bar appointment without paying them.
Consuming a shared resource just to sell it at a profit is completely different from acting as an agent of someone else.