i talked 5times to immigration and also wrote yo a facebook immigration guy he confirmed the bus ticket thing. but you can also read that on immigration homepage
dont understand your question...when i entered the country (from bali for example)....onewayflight no visa( only visa exception....and i dont know if my next country is laos or cambodia....i had no problem....but in many groups i read to have an out of country going ticket like with a bus from one bordercity to next bordeecity is good enough.....i also never had thaibath on me...and never got chevked for that....i just hate to pick up some currency and pay for change again....maybe i have some backup euros on me but not dure if exactly enough if controlled