That's entirely untrue. I met my now Thai wife on TF, almost 4 years married, we live in Australia, she has a PR visa, works 5 days a week and contributes quite well to our living expenses. I will admit quite a few are as you say...but how many "genuine" farang men are on TF?
If you followed the link from Thai visa to Agoda, the price is huge! Look closely at the Agoda price, in small print, they do say "book on our app". So I did, and the price is around 60% less...