I suppose you have to understand the Chinese culture;
marrying service providers is something frown upon by the middle and upper class;
watching too much old Chinese movies perhaps?
I am not saying that they don't make good wives; it's simply the culture.
Because the discussion is mainly on mainland women, hence my general opinions based on my observations.
Thank you for bringing up the subject on the Thai women.
Perhaps you have been reading too much Bangkok News;
No Thai will marry a prostitute. There is a marked difference between the local prostitutes and service providers in Thailand. If you visit clubs and pubs, please note that the girls do not sell their their bodies to every Tom, Dick and Harry unlike massage establishments. They have the option to select the client.
European men marrying Thai girls from the North East is a common event in Thailand. Note that not all the Thai girls are "working girls" . Some of them may be working at clubs, pubs, traditional massage establishments as waitresses, etc. Most men would bring them back to where they came come and maybe only 1 or 2 would visit Thailand out of the thousands.
Mind you, they could be worse then the mainland women. They would devise schemes to suck the men dry and will even kill.
Reminds me of another true story; I was introduced to an American professor teaching in Japan through a mutual friend. Over drinks, he confided that his Thai wife was plotting to kill him. I won't relate how she intend to do it. He needs help to get his son back and engaged a reporter to help him. Have not heard from him since, but 2 years after meeting him, read a report by the reporter, detailing the scheme.
Do the European men have happy ending with the Thai girl? I will it to the readers to decide. Wait till you hear about the stories of the girls sending email from the internet cafe asking for money to buy a pickup for the father; mother is sick and needs to undergo an operation; "Hey I already sent you the money for the hospital fees last week." "Yes, that was first mother, but now second mother also sick"
BTW I have a friend (I think he should be in his 70's if he is still alive) whose wife is 20+. When the group of us are going dining, while waiting for him to arrive, the question would be "hey, what time is the grandfather arriving with his grandchild?
Although I am not Thai and staying here for more than a decade, I am still trying to understand the local culture and mentality.
I know of a couple whose husband turns a blind eye to the wife sleeping with another man; as long as the wife can satisfy his gambling habit; and sometimes I meet the 3 of them sharing the same table having lunch at the local restaurant.