If you want users to pay for your software, put a price on it, and stop pretending it's free. Nagging pop-ups -> Close tab.

I do. I would much rather pay than see ads or be required to give up personal information. I can understand that not everyone wants that, but I do. I also have been very disappointed with usability of FOSS to the point that I rarely consider using it anymore. So yeah, I'm happy to pay (once per version I actually use).