Improve Your Web Site. It takes time. You may hear painful feedback about your precious system. If you cannot change your system. If you do not want to change your system.
Usability testing is a very human way of improving systems.
Your Web Site involves and depends on the humans who use it. Usability testing is a very clear way of viewing the interaction between your Web Site and your Users. This process of feedback, designing enhancements, and improving the system is worth your time. Sources Usability Engineering, Jakob Nielsen. Graphical User Interface Design course, UCD, Spring, 1995.