I was working for a PA-31 operator until June of this year and my salary was £10000 pa plus £100 per day flight pay. It wasn't a great salary but during busy times such as the skiing season when flying at least 3 times a week, after paying the bills there was still enough in the pot to visit the local whore house!
To act as single crew when I applied for the air taxi job, you needed a TT 700 hours with at least 70hours P1 on ME piston with I think 70 hours IF as well. Good luck with your quest with finding work as I can assure you it is probably some of the best flying you'll ever do.