Why is it that at a number of places the fee you pay the MPA is identical whether you book 30 or 40 minutes, but then goes up dramatically for 50 and 60 minutes? For example, at SRM (and other places) the room and a BS is a combined $140 for 30 minutes, and $150 for 40 minutes which is only 10 bucks more, but then it goes up by $40 for the next 10 minutes ($190 for 50 minutes) and then another $50 for the next ten minutes ($240 for an hour), so an hour is $90 more than 40 minutes. It seems when you go from 50 minutes to an hour that's the biggest price jump of all. I'm assuming since 40 minutes costs just a little more than a half hour and a lot less than 50 or an hour that 40 minutes is the time they prefer their clients to choose? Why is that the ideal? Is an hour too tiring / require too much creativity to keep interesting?! Do most massageplanet.netites limit themselves to a 40 minute session because of this price structure, or are there many out there who opt for 50 or 60 minutes, and if so, why? Is there something great going on during that extra 20 minutes?! Just curious - thanks.