this is a tourist trap
This place is a joke. I went there alone, and was completely scammed. I had lunch, which consisted of four flautas and two beers, and they charged me almost $15 american. I went with my wife and her family to eat in her hometown, and three adults and a child all ate for $10. the tour itself is nice, but these people prey on out of towners who dont know any better. The problem was there were no menus, you tell the person what you want, and they bring it, then you get the bill.
Basically they can charge you anything.