The other thing to remember..
The girls that go and dont ask, that might pick a younger guy and it seem 'free'..
You have to remember these girls think we are ALL rich, thats just Thai logic 101, it doesnt matter if your a backpacker in a 300 baht room with a 500 baht budget, they just believe we are all loaded. In a way when you look at our life options and choices available to us, we are !!
So they see any white guy as a possible millionaire husband.. IF they are giving freebies its because they are hopeful that your going to be the knight in shining armour, marry her, and take her to the land of plenty where she will live like beverly hills 90210 thats been shown on TV. Thats her concept of the world outside Thailand borders.
So if your taking the 'free' that shes giving with that investment, with no intention of anything more than some fun travels round asia and no strings sex with girls from clubs, your taking her investment and abusing it with no intention of return. Yes on the surface theres some free sex, but it isnt driven with the same free motivators as a girl in a western club might give. The only reason its free sex is you dont understand the Thai perspective and motivations, its part of a proposed deal, a deal that your not intending to keep your side of.