The era you are talking about must be the victorian times as my mum who would have been 104 now and my dad 113, they worked all of their lives as did most other couples from their generation and the generations since.
Yes, I agree, most of the farang blokes I have come across marry poor Thai women, the reason being they could not get a professional type of Thai so they settle for what they get, and in many cases the woman is with them for their money.
Also many of these guys live in Isan and are surrounded by many other poor people, their view of Thailand is biased.
I am not a snob and bigot about others, I was merely trying to balance the truth that not all Thais women are poor, there are very many who have made their own way in life, many farangs have never come across such women.
I can understand farangs getting upset about the truth I come out with as they are in denial, they have probably already found out why their wife is with them.