XBMC is on virtually 24/7, and stands for at least 95% of my xbox usage(that says a lot about XBMC because there are SO many other good things one can do with the xbox).
Considering they don't sell new xboxes here anymore, I'd never sell my xbox for even ~$700(that's where I'd search for old ones). I love watching films and nothing has a better interface and usability than XBMC. The community supports you, and the developers support you, it's just fantastic! But, I'm afraid something has to happen if it won't be able to run 264-videos. If XBMC move to any other system that makes it even better, I'll buy that system for the sole purpose of XBMC. Hands down, I LOVE YOU GUYS!