Read about another myth here which I believe is also very common:
Testers Add No Value to The Software
People who conceive this myth often are made to believe that a tester’s role is strictly limited and adds no value to the product.
On the contrary, a skilled tester is often an expert of the system (product) under test. Unlike the programmers who often spend most of their time working on a very specific area, function or component of the application, the tester analyzes and understands how the entire system works from an end-to-end standpoint. Testers get a better chance to demonstrate their understanding of the product in a way that adds value to to the product.