Why assume that rich Thais would ever mix, socially or sexually, with bar boys? However, if a rich Thai ever did take up with a social inferior he would understand without it having to be explained to him, that his role is benefactor and patron - that's the Thai way
It's been said over and over again in this Forum - you think you're the Thai guy's boyfriend, he thinks you're his patron. Unless you face up to that reality you're going forever to feel ripped off and used, the "walking ATM" and all those other cliches we hear week after week from people who simply don't understand or accept their role in the relationship
In fact it's no different from the "kept" boy in the West - other than most people who post here want to ignore reality, perfectly exemplified in the following declension:
My boyfriend is a dancer
Your boyfriend is a go-go boy
His boyfriend is a prostitute