[dirtae]

Charging for software on a one-time basis without paid upgrades is inherently unsustainable. The only way to make it work is to, as the author points out, continually find new people who are willing to purchase your software. If you can find an infinite stream of new people to purchase your software, then you may be able to make it work, but in practice, there aren't infinite streams of people.

This post seems to have been written two years ago. I would like to see an update from the author on how his "free updates to people who only paid once" strategy is working out in 30 years.

(Of course, if you don't care about building a sustainable business, and just want to make some money now and possibly abandon everything in a few years, then this doesn't matter. I personally am interested in building sustainable businesses, though.)

[skj]

You could make a new product and sell it to the save people, too.