Dan, I don't think anyone here would think twice about whether you used a donated server for other stuff, personal or otherwise, as long as it worked out ok for the chat or other CT systems. You've put a lot of personal sweat and time and money into CT, it would be a wash.
If at any time in the future you feel you need a server, please let us know - I'd be happy to help out by contributing the first $100 to get the fund started.