Believe me there are some sad people here who are desperate for Prestwick Airport to close and Ryanair to move lock, stock and barrel up the road to Glasgow. I, like you, would love to see Prestwick Airport get used a lot more. But I don't want to see Glasgow close either. Both airports provide jobs.
I read on here a while ago that Infratil copied its charging structure from its airport in Wellington. As a result it cost more to land at Prestwick. Infratil haven't exactly made a success of their European Airports. Maybe its time they pulled out and let another operator take over that could do the job better.