I think this is a great idea. Let's fill up the Georgia Dome!!!! We did something similar to this last year as well. Our team didn't make it but a few of us joined Krunch at the Championship. It was a lot of fun. You learn a lot about how other teams operate plus it's a different experience to go to the Championship without having your own robot. I'm usually always in the pit so I finally got to enjoy a competition without the pressure.
As for the hotel room issue. Atlanta has hosted the Super Bowl and the Olympics, there are more than plenty hotels in the area for interested teams. You may not be able to get rooms at the team hotels but you can be very close by. Like the Georgia Tech Hotel for instance:
Georgia Tech Hotel 
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I think the more people at the Championship the better.