One time pricing is a bit of an issue. See, when you sign up for a plan, it's for access to updates and support. Even if you only pay for the first month you get to keep the software forever. Or you can simply download it from our GitHub repo. For our monthly fee you just get the convenience of the automatic installation, updates and support. With community support it's only $29/mo or $290/year for the who whole package. Now, we could offer something like a "permanent" license for it, but in practice I see how this practice creates unhealthy habits, when the clients that aren't on subscription become "less important". It's also very hard to budget for future development then. So, let's say a $600 investment would buy you over 2 years of subscription. Beyond 2 years your project would either be able to pay for itself comfortably or become obsolete. :)