Everyone who? It's highly unlikely that companies will pay an awful lot of money to these maintainers anyways, so only the less "priviled" (i.e. second/third world citizens mostly) will benefit. Moreover, while some individual maintainers will gain in short term, the developers as a workforce will definitely lose (because certain tasks are taken from freelancers, contract workers and employees and distributed to, well, public). Business does not need more developers (let alone better paid ones), it needs more work done faster and for less money.
Also, I think that most people, who maintain decent OSS projects, have well-paying jobs anyways, so they don't need more money and more work to worry about. What they really need is pull requests and bug reports. Which the business can provide by _hiring_ people, who need money and work, to do the job and send the patches. Double benefit, everyone's happy.
