thought i'd reply to this as I have seen many of the shows listed on the "menu" over the years at various patpong venues, I think me and mate are actually one of the lucky few that seem to escape being scammed. Tip is to check with someone inside the club on costs before even sitting down. I once remember someone getting a bill for 4000 for a bowl of nuts that had been brought with drinks, he was told it was 200 for the nuts when the bill came it turned out it was actually 200 per nut!!
Havent been to these places for a few years I think maybe the scamming is worse now than before, although I was impressed with the shooting darts, smoke rings and trumpet playing ;-)