cuz people like to play stupid games. There are people smuggling sxxt even tho they know that airports are filled up with sniffing dogs but they still take the risk
mate, I am often on tinder and 99% of those one saying they were looking for a long term relationship/ distance relationship were hookers that played that part of the good girl. I shagged a lot of hookers who have an oversea boyfriend (often more than 1). Never, never, never believe you've found someone different that the others, they are all the same, especially if they are ok for having a relationship with someone they meet twice a year..
there's no fixed number but if you spend over 6months in thailand without a proper visa, you might get pulled apart at the airport to figure out while you come here this often. You should consider to apply for a multi entry tourist visa which can guarantee you up to 9 months in the country...