That is because users are increasingly getting used to not paying for the work of others, be it because of open source software (do not be deluded, for the vast vast majority of users free software=free shit), because of freemium software, because of adware or because of we-mine-you-to-death-and-you-like-it software.

People and companies are ready and willing to pay. The resistance comes from open source projects doing unscrupulous things like changing the license terms of the original project. As a contributor to some projects which eventually removed the open source option and went full proprietary, it's hard not to feel slighted. I didn't sign a CLA and wasn't consulted in the unilateral decision. The damages aren't large enough to justify taking legal action, but it hurts to watch your contributions essentially stolen from you.