And once they know all of your ads and keywords they drop you and do it all themselves. This is one of the big reasons blanking referrer was started. They will let you figure out how to make their stuff sell then as soon as you are starting to get a return on your investment they cut off the channel to affiliates and do it themselves.Do you think that every offer is a ppc winner ? Think again , most of them wont get you a profit so you have to keep on tweaking the ads and landing pages and so on until you make a profit , thats why they need affiliates , to do this.