I am a support specialist in a NPO, as well as a volunteer support member for other places.
I know how it can be, but never would I let my members go 1-3 months without a reply.
Also, if what I have is free, I will NOT charge for support.
The sites that my multi-site is used mainly for are NPO organizations, like Churches. I will not ask them to fork over money they need to help supply food to the poor, because someone wants to make money off supporting what should not be charged for.
If they wanted it to be charged for, then make the plugin a paid one, not a free one. I think I have been very patient, more so than I should have been. I even was helping here, as can be seen from my posts. Yet, since I have seen the 1-3 months in my own support topics, I have decided to stop helping here, and focus my time elsewhere, where they know how to treat their "customers" in a better fashion.
I have a few WordPress sites, and due to the lack of support, I'm not certain that I plan on keeping them. :(