Nevertheless, I sometimes do bring farangs into my realm to hang out with, sometimes deeply. Then, whatever happens, happens...
Before a farang even considers a "good" Thai girlfriend, he should consider the ramifications. He will have to give up the bargirl adventures in his life. (Some women put up with their boyfriend engaging in shorttime liassons behind their back as long as they come home on time every night, but it's not true that this is generally accepted in higher class Thai society. MOST Thai ladies do NOT tolerate this.) If he changes his heart and mind about his current girlfriend, he won't be able to dispose of his good Thai girlfriend cleanly with a 1000 baht note. He won't be able to get into her pants on the first night, and probably not the first few nights. Whenever he gets that far, then when he does get to her panties, she will usually be shy (depending upon the friendship trust and art), and it won't be the same kind of experience as with a prostitute, for better or for worse.
In my opinion, quality beats quantity. Of course, just my opinion, different strokes for different folks.
A lot of guys on the internet have stated that they've become less sensitive and more hardened by spending too much time in the bars. I would suggest to these people that they try a courting kind of relationship over time. Your mileage may differ, but none of my one night stands have come close to any of my courting relationships.