I think that, based on my experience, there was not a connection between the price of the massage and the skill of the masseuse.
For example, in Patong, you pay more for a massage from a shop on Beach Rd. than you do at a shop not near the Beach. In Patts, you pay a higher price for a massage from a shop on Walking Street, Beach Rd. or one of the busy side sois off those streets. So the price has more to do with the location than the massage you are getting. Same in BKK, as you pay more in the busier Sukhumvit locations. And you will def pay more, if the place has got a grand facade, marble floors, mahogany front desk, attractive girls to greet you at the door, nice furniture, a top sound system, etc. All of which has value to some people, but is not the massage.
In BKK, I have been told that you can get the same massage in Pratunam for 150 Baht that you will pay 500 Baht for in Sukhumvit, because the shops in Pratunam cater to Thai clientele, not tourists. But the Thais are not going to accept an inferior quality of massage than a farang tourist!
I would hope that the consistency of the quality of massage would be better when you are paying 10 times as much. I know in the cheaper places, not every girl is good, and sometimes you have to shop around to get a really good one. But I have had some pricier massages, and they were OK , but not the best ones.
I think that that it the main reason. I mean if it really doesn't matter to a person whether they pay 200 Baht for an hour massage, or 2000 Baht, then why not pay the higher price? I think there are loads of people in that income bracket, where it simply doesn't matter.
There are some for whom it matters, but they want the pampering, and the extra measure of deference that goes along with a higher price. Because for some(not you Paul..555..), it makes them feel good about themselves. It is the "I worked hard for my money, I am successful, I deserve the best treatment" mentality. Nothing wrong with that. If that is what rings your bell, and you have the money, then go for it.
But, as MC, confirmed, you can get the same massage from a gal with more experience, in Kamala for the regular, non-luxury rate. You might also get a gal who looks like a Sumo wrestler, can't speak two words of English, and has a feisty attitude. And, quite frankly, if she is the best masseuse, then I don't care about that. Cute girls are rarely the best masseuses. Speaking English has nothing to do with massage. And if a person is delivering the best service to me, I can even put up with a wee bit of attitude, sometimes(but then they have really got to be sueforum.xxx!).