I found interesting stuff on plentoffish.com founder’s blog. He posted data from Hitwise about income of dating websites users. And here they are:
4.11% of wwwsinglesnet.com users make over $150,000 a year.
5.05% of wwwmatch.com users make over $150,000 a year.
6.23% of eharmeny.com users make over $150,000 a year
12.37% of wwwplentyoffish.com users make over $150,000 a [...]