Redhat sells support services, among other things. They hire key people in key projects so that if something goes wrong for their clients, they can get it fixed expediently. When your production is on the line, you'll gladly pay for the piece of mind and the very real reduction in business risk.

Really? Developers are not exactly the cheapest resource on the planet, and while they don't code every piece of software they package... they still package it, they still give it at least some form of testing (e.g. will it install if it's on this image)... it's not expensive in some cases but it's not free either.