In an airline now, picking up a bit of instruction on the side as and when I can, hoping to do a few night ratings this winter.
It is well worth it, I loved every flight, you get to meet some amazing people, you learn a lot about flying, how people learn and you learn a lot about yourself.
Pay is usually by the hour, you may find some small retainer deals, but the average pay will probably be the same. I averaged about 5-600 hours a year. average income around £15k gross, haven't done the full sums for this year yet though.