As of March 1st, that standard will be replaced with a new category-by-category system. That means affiliates selling products in certain favored categories will get higher rates, including “digital video games” and “luxury beauty,” while most products see a steep drop-off. Amazon says the changes were made to simplify the system and that most associates will come out ahead, although it’s unclear how to square those predictions with the falling rates.
Hiding content on a webpage or hiding affiliate tracking code in links. Hiding content on a webpage is bad as it is against the guidelines of the mainstream search engines such as Google. Hiding affiliate tracking in a link is an acceptable and widely used practice. If you'd like more information, I wrote an article on why and how I cloak affiliate links.
And what about joining another company's affiliate program? It's all about extra revenue. Think about your customers' needs: What other products or services would interest your site visitors? Join those affiliate programs. Affiliate programs can increase your sales with no upfront cost to you. It just takes a little time to plan your strategy and select the partners that will have the greatest impact on your business.