What to expect when entering Thailand on a Non-Immigrant Business Visa amid strict immigration checks?

Interesting experience just had at immigration at BKK airport, flew in first class with China Airlines so they gave me a VFS fast track pass that I used, 6 IOs 4 of them female 2 male, was trying to walk slowly as the male IOs had one person each being processed, so got waved over, she looked at my passport and didn't like what she saw, I was coming in on a non immigrant business visa, however she called one of the supervisors over, then fun and games started, they asked me "you work?" I reply "yes on this visa I start working" but they were more interested in my past visas, as I have 5 metv back to back and about 7 visa exempt on my passport, they kept on asking "you work before? and I kept on saying "No! Non-work before, holiday!, But now start work as I have business visa, Anyway half an hour later they stamped me in, what a nightmare, I knew DMK was bad but BKK I think are cracking down or questioning people who have been here on tourist visas for extended periods of time, just thought I would share