Pay varies very widely, as the amount of work you may find can be entirely unpredictable, and can change very unexpectedly. I've seen seasons that barely made fifteen thousand, and others that did very well. Today with larger turbines taking over and fewer and fewer jobs, more work being taken by ground rigs and chemigation and more experience overall required to get a job, don't count on making much if anything, and plan on having a tough haul to find a job.
Most operators want to see a thousand hours of ag time before talking to you. Jobs in AgTrucks and smaller airplanes are outthere, but most jobs rightfully equire substantial experience.
Government contracted spraying in Colombia works two weeks on two off, and pays about ninety thousand to start. Training can take four to six months and pays about thirty grand yearly, on an hourly basis, with no gaurantees. About fifteen hundred hours of ag are minimum, but generally more like six thousand is competitive. Speak spanish, and have solid instrument skills and multi engine time. Hiring presently isn't into the singles; it's into the OV-10, and a fraction of those who apply, get accepted.