I never understand why so many font studios do this. I don't mind paying a fair price for a good font that a professional has designed, for the same reason I do

I never understand why so many font studios do this. I don't mind paying a fair price for a good font that a professional has designed, for the same reason I don't mind paying for a good book. But the terms for using it have to be sensible. They are now competing with some high quality fonts that are also comprehensive and professionally designed but free to use with few restrictions, so the licence needs to be simple with no sense of danger or I will walk away immediately. Some of these font developers seem to think they are the reincarnation of Elvis or something with the level of hassle they think people will go through to pay them money!