I guess it's something like "This easy and sometimes fun activity, which is incredibly common and normal here, gets me pretty much free money (an incredibly important and almost fetishised thing to me) and, due to my culture, there are no negative consequences".
Yes it is about culture. Whilst westerners furrow their brows about prostitution, and the mental negatives they presume invade the mind of 'the provider', Thai culture is different. TIT. When I once broached the subject with a very honest Thai girl she said "my pu**y doesn't care, it's like going for a pee and I get 1k baht" I was gobsmacked, but instantly educated!