@All***
3 times or 30 times there is NO RULE about how many times you can enter Lao. :/
Pretty much you just show up at the border, stamp out of thailand, BUY your visa on arrival to Lao, stamp in and you're good to go.
The closest REAL rule that has anything to do with what you were told is the fact that you can ONLY get TWO 30 day visa exempt entries by land in a calendar year to get IN to thailand..