Think how difficult it is to get most companies to listen to your needs, much less ship what you need, versus being able to contribute your own pull request and have it merged.
Why should this mean the source owner deserves any less of a product revenue than the company that won't let you add your own features? It shouldn't.
If you get your feature merged at the long end of a customer relationship / product manager interaction, do you expect that means you should get paid for your feature request or get to keep it? If you write the spec for your feature in code instead of a PowerPoint or Word doc, so it does what you need exactly right, you're still asking them to ship a feature you need, just better specified and delivered sooner. It lowers the overhead both firms waste, which lowers your licensing cost and your cost of delay.
From the viewpoint of a CTO of a mega enterprise -- a vendor that lets me make things work is worth more per month to me than a vendor that won't, and no, I don't expect my enterprise get paid for the vendor accepting the fix that scratches my particular itch.
