I think people place too much emphasis on airlines paying for airbridges. I'm pretty sure that many airports don't charge for airbridge equipment. Certainly at Easyjet there are places where airbridges are used religiously, sometimes, not very often and never at all.
I agree. I know airports where even Ryanair use them almost all the time. AGP is one of them. I also dont know any airports where Monarch refuse to use the airbridges.