Soi 6 BJ bars same service, 500 baht price difference between shops

Checked out a few Soi 6 bars this week. The service is basically the same everywhere short-time room upstairs, same menu of activities. But the prices are all over the place. One bar was 1,500 all-in, the next one over was 2,000, and a third wanted 2,500. For literally the same thing. When I asked why the difference, the mamasan just shrugged. No explanation. This is the problem with Soi 6 no price transparency, no consistency. You're basically gambling on which door you walk through.