I think I'm correct in saying, if you stay less than 180 days, and just do 1 or 2 visits per year, visa exempt, you're not breaking any laws. After 180 days, you will be liable to tax in Thailand.
It's means if you enter Thailand you will get 60 days VISA exempt. You can then extend that by another 30 days (1900 baht) , so giving you 3 months in total ..if you want you can then leave Thailand to neighbouring country and then re- enter getting another 60 days exempt. I'm sure if I'm incorrect, I'll be corrected
cheers. I'm not a cheap Charlie unlike many keyboard warrior trolls on here. I don't need to carry on working, having retired from military and government organisations