Comment by JoshTriplett

In a business context, I'd definitely consider paid support for an Open Source product. But I'm not interested in a proprietary version that I can't modify or get third-party support for or otherwise work with in a pinch; I'm certainly not going to make a business dependent on it. Push the proprietary version hard enough and I'll reconsider whether I even want to use the Open Source version, or if it might be on more tenuous ground that might get undermined in the future (pushing back on improvements to the Open Source version to maintain differentiation, or worse, deciding to switch to a non-FOSS license in the future).