That many hops and only one sale is not good at all, as a general rule of thumb people would say that you should get at least 1 sale per 100 hops. If you check the affiliate page of a vendors website for the product that you are promoting you can see what other affiliates are currently converting at depends upon sales page and product some can get 1 sale in every 10 visitors and more. The other key here is that even for the 1 sale that some affiliates get they have an opt-in list so that they can get back to those potential customers.