Affiliates decide within their affiliate programs which banners or ads they're going to place on their websites. This decision is based on their individual calculations of which company ads their website visitors are most likely to be interested in. They will also agree to affiliate programs based on which merchants have the best commission structure, although the structure is not usually considered very high-paying or profitable.
Your small business must pay state income tax in the state you operate in. Depending on how your business is organized, you could pay corporate tax or a limited liability company tax in addition to your personal income tax. You may pay taxes in the state the selling company is located in if that state taxes entities who earn money within their borders (even if the earner is located out of state). Your affiliate marketing company is considered a separate entity from the selling company when it comes to figuring state income taxes.