The most important commodity on any dating site is young, attractive, white women. They bring in everyone else, have a look at the OkCupid blog for the hard numbers.
These women aren't interested in 35 year old neckbeards with clammy palms and they get pissed off with the sheer volume of unwanted messages from people they'd never date in a million years, it causes them to leave.
Seriously, set up a basic profile as an early-mid 20s, attractive white girl on a free dating site and see the shit you get sent.