I’d be happy to pay $19 once, just as I’ve purchased my other apps. I’d even pay twice that, and I would also consider it fair to charge for upgrades.

But I believe in paying for value, and the value of the software should be covered by a one-time payment, as is the case with purchasing any other product. Continuing to demand payment without providing additional value—a service, computing resources—is not reasonable or appropriate, and I can’t support that business model.