Swedeman - why do you think they would change from standard farang customers to "Arabs" and such? You do know the majority of farang p4p tourists are after gg action - postop lbs would simply move into that customer base.
It seems that you have an inaccurate view of the customer base for postop lbs.
The determining factor is how well did the doctor do with regards to the SRS surgery. If the postop lb can retain her ability to orgasm, her postop vagina appears good cosmetically, and in some cases even self-lubricate - they will really enjoy having sex. These lbs will generally be well adjusted and eventually get out of p4p.
If on the other hand she loses sensation, the ability of the lb to adjust is not as good. Lbs in this situation may become depressed and if the cosmetic appearance of the postop vagina is bad - perhaps even suicidal.
Something that a lot of people don't know, p4p lbs who have had SRS are instructed they should not have sex until at least 2 months postop. However, many of them go back to work sooner, and this is before the vagina has fully healed. In addition nerves may not return to delivering full sensations several months postop. This contributes to impressions we get that "many" lbs regret SRS.
All this is anecdotal as well, but having had experiences and knowing 50+ postop lbs over the years, this is what I've encountered.
If an lb you know wants SRS, she should not try to save money and go to a "cheap" doctor, she should have her operation done by the best SRS doctor or not do it until she has saved up enough. Currently the best is Dr. Suporn in Chonburi.