I'm sure you guys know about this already, but they published a rule change in the Royal Gazette stating that effective Dec 31st, 2016 they are limiting visa exempt entries when comin' in by land to 2 per calendar year.
This rule change will not affect anyone who has to "border-bounce" <-stamp out of thailand, stamp in&out of another country and stamp back into thailand to activate another entry on a multi-entry visa.
There is as yet no "official" limit to the number of times you can fly in and get a visa exempt stamp.
I guess its a good thing that single entry tourist visas to thailand are free at all thai consulates in the world until Feb 28th..