You're looking for logic where there is none to be had there Steam.
Tryin' to rationalize something as quirky as 'thai logic' <-(an oxymoron if there ever was one) is even more futile..
In other only slightly related news, I talked to the two big visa run companies in bangkok and they're nearly fully booked for their last 'official' trip to Vientiane for double entry tourist visas before Friday. One company said they were looking in a chartering a big bus as they had a whole herd of people calling them up wanting to go get one before it's too late.
Interesting times that's for sure..