An interesting question. I think the OP was using the terms working class, middle class etc. as they are used in sociology, defined primarily by educational level and job classification. There are plenty of retired diplomats, professors, ex-United Nations staff and others who were at high levels in their profession living in Thailand. And they love it. Many of them live in Chiang Mai, or in Bangkok if they are still semi-active in their field. They communicate among themselves, and in activities like a film appreciation course or book club. While many of them read, enjoy, and learn something from ThaiVisa (sorry, ASEAN Now), they will rarely (if ever) submit a post. I think this is because in their professional work they would give an opinion only sparingly, in their area of expert knowledge, and after careful review of the relevant facts, while the ThaiVisa (sorry, ASEAN Now) posts are more ... um ... free-wheeling.
But if I'm needing to know how to fix my leaking roof or how to keep my 12-year-old Toyota on the road three more years, I'll come to you guys! Seriously, you are great! And we "intellectuals" would be lost without you.