ClickBank is a valuable tool for affiliates, but it could be a little more affordable as far as trainings are concerned. Setting up pages that will earn you an income, and that will also attract others to want to promote what you are selling is a challenge until the learning curve is conquered. With those issues out of the way, it's a way to earn money, and to have others promote your wares while everyone benefits. ClickBank is a valuable service with a tried and true record.