For PPL instruction, my school charges me out at £75. I get £44 per flight hour. No retainer. No benefits. Doesn't matter if you have 300 hours or 3,000 hours, you still get the same. The school also makes a profit on the aircraft presumably.
Yes, it's time for a change. But there will always be some 300 hour newbie who will work for less. Just like there will always be 1,000 hour piston instructors who will work for practically nothing to get turbine/twin time.
Don't get me started. The whole situation is depressing!