We once started a dating site in Belgium/The Netherlands, first put in 30 fake profiles of some amateur looking women and then sent traffic to it (not that honest but it worked). After a few months our free datingsite had a couple of 100 of guy profiles and 10-20 real women profiles. @ that point we removed the fake ones and noticed no difference in new profile additions.
But thats how we did it, don't know what you had in mind
