Right on! That is definitely something I am willing to explore over time! I know Basecamp has been experimenting with the Pay Once model with great success.
I don't really have a use for this particular software, but I wanted to add my +1 to pay once self-hosted Sofware. It's such a great model for the customer and I have bought software with that model even when there were free open-source alternatives. I really hope it works on the business side as I would love for it to viable.