Not sure re attendance figures, that would mean some bang average layer at say Celtic would be worth more than Turnbull, to my mind the level of development compensation should have nothing to do with what league, or level within a league a player is developed at, whether it's Real Madrid or Motherwell the same hard work and effort from the coaching staff applies, so a base level should be set.
There could then be enhancements based on games played, international recognition etc