Why the up charge on phones

Stopped by 9n a recent Sunday night. Was told $5 cover. Ok, no problem. Driver’s license scan by door girls phone, not a fan. Need to check your phone at the desk. Or keep it and pay an additional $20 cover charge…. No thanks. Drive back to Philly with my curiosity about strip clubs in central PA unsatisfied. Somehow I think that even if my curiosity was satisfied, I would not have been satisfied, IYKWIM.