6000 $ is about 13 to 14 sales per day, if one sale is for 15 $. That doesn´t sound very much, but it is.
If your traffic converts 1 to 250 - and I´m afraid most of the traffic doesn´t - you´ll need 3500 visitors per day on your sponsor´s sites. Those visitors are not easy to get.
So the only way is to invest a lot of money. But where to invest it. If I would know where, I would do it, probably...
