Am I missing something
Yes, unfortunately you do.
If you would have taken a closer look you would have noticed that you're looking at the "normal" stats, which
include ASICs.
A more closer look would have finally revealed that the most of the top users make their credits at Bitcoin Utopia.
And in case you don't know it - a 20 GHz ASIC earns exactly 2,4 million credits per task.
Adding to that, technology keep changing at a fast rate. Originally credite were based on the performance of a cpu. It now became a complex issue. When GPU's started they performed a taks say a hundred times faster than a cpu, now ASICS are considerd thousands of times faster than a cpu. These ASICS also costs thousands of Dollars as compared to CPU. Unfortunately at this time they are only usefull at a couple of projects, mainly at Bitcoin Utopia. The calculations might seem absurd but it was based on the same formula of comparison as was the original system used for CPU's completely skewing up the system of credits. Unless you can afford Thousands of dollars for an ASIC all I can suggest is just look at the stats that says: Combined Stats without ASICS.
Keep on crunching and have a nice day...