Paid "practice stages" is a new one on me.
I'd pay a bit for somebody to hang and score targets for me; I guess if I were in a high cost of living area $15-$20 for live practice might not sound too bad.
As it is, I am on my own for practice and IDPA entry fees are $10-$15 for monthly club shoots. Which I can find nearly every week anyhow. Club membership is not required. The range is supposed to require you to join IDPA after your first match, but that policy is roundly ignored.
I doubt the USPSA around here is much different.