In the Championship it is £29k per week or £1.5m per year.
Back in 1992, before the Premier League began, the average top tier player earned £60k per year, tier 2 was £34k and tier 3 was £22k. Adjusted for inflation that's £127k, £71k and £47k respectively.
So where is the downside from the premier league for lower league clubs?
The average third tier player is getting paid more than top tier players used to get before the PL was invented.
I think it is safe to conclude that for the people providing the entertainment, the Premier League has been overwhelmingly positive at all levels.