There is not even enough information about the job to understand the salary. However, even if the ONLY thing the pilot did was come to work, act as PIC on a turbo jet, and then go home, on the surface 60k seems a bit low, even in the south.
Reading between the lines, I am thinking this is a "new" flight department. So, that begs the question on this whole 135 portion of the gig. Who is setting that up. Is the plane going on an existing 135 certficate, in which case there is existing support staff to do billing, record keeping, maintenance tracking, etc...OR is this "new" pilot going to be responsible for setting all that up.
I'm thinking 80 to 90K for a basic CPT running the flight department for that class of plane. IF the person has anything do to with setting up and maintaining a 135, then the number should go up, IMO.
And I would agree with a previous poster that it would not appear these new owners are looking for a 'steeping stone' employee based on the minimums they were recommended to post for this gig.