I can't imagine that works very well for relatively small, simple, functional or intuitive projects though. Incentives wise, is it possible to sell reverse support: extracting payment for all the times the product works so well that support isn't needed?

Selling support can be rough. I talked with the developer of PyMol.

Many corporations wouldn't buy licenses and those that would pay for support wanted support for hardware that was 2 or 3 generations old.

Gentle reminder: please encourage your corporation to pay for open source support whenever possible.

That doesn't work. My day job is at scenario working on NATS and I can tell you 99.9% of people don't pay for support

As a NATS user, I can say that's mostly because it just works and when it doesn't it's pretty easy to figure out :)

yep, and you'd think someone that has seen that would pick a different model... idk, ngmi