In theory you can

If you know anything at all about web design, you’ll make far more money as a web designer, than with that system. If don’t know anything about web design, but are good at sales, you’ll make more money working for a ISP on commission, than you will with their system. (For that matter, other than the 15 or so largest ISPs, you probably can get some type of commission, for directing new customers to your existing ISP.)