Actually he isn't if you read the shooting times you will notice there was a classified job available three weeks ago about someone wanting a full time pest controler to come on his land to sort the rabbit and pigeon out, he was offering a fully paid for three bedroom house.
First and only time ive saw something like that though.
A friend of mine was a full time warrener, also done fox,pigeon,corvids and other vermin on an estate near me.
Tied accomodation,4 bedroom house, ran some of the small let days on the estate,took all the usual perks as the keepers did and ALWAYS had money