A three tier affiliate program allows you to both get commissions from new users and new referrals, both for life. For example, if you refer person B, and person B refers person C, then you get lifetime commissions from both person B and person C. Three tier affiliate programs are hard to come by and are great ways to make passive income.
Here are a couple examples of 3 tier affiliate programs that make money.
Bitcoinera.net – Bitcoinera.net is a Bitcoin wallet that pays customers 6% interest per month for their deposits. For referrals, you get 2% interest of their total deposit, and for second level referrals, you get 1% of their total deposit. You can even get 0.5% interest for third level referrals, effectively making Bitcoinera.net a 4 tier affiliate program! If you have no experience with Bitcoins, it is super easy to set up an online wallet at Coinbase and sell your Bitcoins for cash and deposit them to your bank account. You can check the online exchange rate at Preev.
Virwox – VirWox is a digital currency exchange of Bitcoins and Linden Dollars, the currency of second life. Users can buy Bitcoins instantly or Linden Dollars with Paypal or Credit Card, which is a service in high demand. Not only do affiliates make lifetime commission from referrals, but they make money from the referrals of referrals. There is no limit to how much you can make from VirWox if you keep referring referrals.
Bitcoinera.net and VirWox are real services for people in the Bitcoin industry.