save your time and money
I tried this, it's a scam. I had 5 people complete one of the special offers, but on the last 2 it tried to tell me that they signed up and completed an offer, but I wouldn't get credit for them because they didn't sign up using me as the reference. YOu had better believe they clicked on the link in my e-mail.
EDIT: BTW, MAKE SURE you get in contact with any companies that you sign up with. They don't just send you a free trial of vitamens or weight loss pills or a free CD-ROM. they sign you up for "autoship" and will bill you monthly (usually outrageous amounts) and ship you more product.