By far the most successful financially - with a turnover of A$300+m - is www.AnastasiaDate.com. However, I do not recommend it. In my opinion, it is 95% a scam. It is difficult to get the details of the ladies and it is exhorbitantly expensive.
The sites below share the profiles of the same ladies. However, you should expect that 90% of the ladies who seem promising are either fake or not serious and leading you on. The lady whose picture is in the background here was on AnastesiaDate.com and she wasted my time to the tune of thousands of dollars. I found out later that she was on the websites below. I hope you can see the irony.