Minimum amount for Itraders

I am seeing a lot of this lately, people selling or paying some shit amount and getting itraders for that.
Example
http://www.blackhatworld.com/blackh...-lots-people-20-second-job-paying-0-15-a.html

This happens at DP where scammers build up their rep and itraders by paying cents for them and then post a big scam and vanish with several hundred bucks in their pockets.