Greg.

You have come across the same problem I have in the past.
Farmers bitching about the damage the feral hogs are doing and that they want them gone.
When I have offered my services to bring a group of guys out to thin them down I get well it's gonna cost ya "X" amount plus "Y" amount per pound.

Thats when I usually just say well enjoy the hogs cause I am not paying to try and help you out.