The warnings being posted here are possibly the best free advice that you will ever receive. Don't even think about it unless you have powerful, connected friends able (and willing? - and if so, how much will that cost?) to manage the BIB, various tax authorities and City Hall. Google "Pattaya jet ski scam". That will give you an idea of some other challenges you are likely to face. If you start a business there then even when you believe that you have all the necessary permits, permissions and payoffs in place you will find yourself assailed by a constant stream of "officials" (some genuine, others less so, and even the fake officials can be accompanied by the BIB to make you believe that they are genuine) with eye-watering "fines" that you will have to pay due to an alleged transgression of a law or failure to pay a "tax" of which you were unaware, or failure to get a permit the obtention of which is impossible, and even the genuine officials will hit you with trumped-up fines/taxes - because they can. As a foreigner, you are the low-hanging fruit.