Low chargeability generally means you don't have many clients. Low realization means the clients you do have aren't paying you much. High numbers in both are a good indicator that you're doing something right. It may take a while to come up with levels that are comfortable for you and make sense for the way you run your business. But these are the measures to look to when determining how well your firm is really performing.
Web design is a relatively new business model.
These statistics are great tools that can, if managed properly, help you stay in that creative world as long as possible.