[robryan]

Subscription model fits better. There are ongoing costs to maintaining the service indefinitely.

One off cost only really makes sense when you can sell a piece of software as being done essentially and move onto the next piece of software to charge a one off cost for. Having a one off cost to find ongoing costs probably isn’t going to end well as soon as a product is no longer growing.

[FpUser]

If there IS A SERVICE. Releasing new version of software is not really service, Netflix is. If new version is compelling enough I'll upgrade, if not then it is vendor's problem. As a customer I could care less what suits better for Vendor. I am not paying $5-10 or even more/month 100 times. That is insanity.