If MSFT centric people think open source is a waste of time that helps their competitors, and open source contributors are wasting their time helping their competitors, then doesn't that mean the MSFT centric people are perfectly right, and people really should avoid contributing to open source unless it help their own interests directly?

If you want open source and user pays at the same time, then it's not really open source. What you end up with is closed source which has already worked well for a lot of companies.