Hi,
The general impressions I got from phoning up various coarse fisheries in Lancs and North/West Yorkshire are
1/ They hire you a peg not a lake ( so your fishing more than one peg. Lost revenue!)
2/ They dont like wandering people
3/ They think you will catch more than the boillie/bivvie brigade. (brigade doesnt return, lost revenue)
4/ They think there will be an avalanche of fly anglers as soon as word gets out. (All of the above)
5/ They think you dont know what you doing.
6/ There insurance doesnt cover it

7/ Best reason of all " thee cannot fish ere lad, thee will catch too much and put the fishery off"
Some fisheries, Raygill for example will give you a warm welcome and his blessings to fish for his carp.
Dave