Advertisers are willing to throw buckets of money at publishers who can get potential clients to try their products. This is the basis behind the “free ipod” phenomenon. This is called referral marketing and has been used for years in places like gyms where members get discounts (a free month for example) by bringing new members to the gym.For every person that completes an offer the freebie site will be paid up to $70. If you need to refer 5 people to get an iPod, 5 referrals + you = $70*6 = $420. Easily enough to cover the cost of the iPod or other freebie.