I hear alot of the same things from land owners that rockyshamrock mentioned. Some farmers say part of the reasonor at least abenifit from leasing is as shamrocksaid--they dont have to deal with trespassers and everyone asking to hunt.
As far as laying blame for leasing --I honestly dont feel youi can blame the land owner. If they are offered top dollar for leasing/hunting rights they are nuts not to take it.