PPS you say you get the YMCA very cheap, and are a non profit organisation but people aren't coming because you are in a low income area. Are you charging too much? Although we maintain a small float, it is that SMALL. I knew a very popular non-profit club that started charging increasing amounts to develop a float and eventually work towards building their own dojo - students left rapidly as the cost went up. If you are non-profit, you should try and ensure that students really paying only for the hire of the hall and the insurance directly.
Also, can you get help from joining a local aikido affiliation? (I think maybe in the US this is more restrictive)