This software looks great and I plan to use it when released, but I had an idea regarding licensing and costs.
How about releasing the software at no cost, but charging subscriptions for support? That way you can charge for say a year of support for X number of dollars, but if people really want to go it on their own, they can.
Even if it is commercial I'd be likely to get it, however, because for the idea I have for a site it is a necessity.