My index page ranks #15, so I am in the same boat.
There are over 20,000 links to my most popular page (WMT).
But WMT doesn't even list the links to my index.htm page.
The link:siteindex.htm command says 3, which is patently absurd.
The link: siteindex.htm command says 445,000, which is also absurd.
I believe that the true number is somewhere in the 100's.
Add that weird chunk of data to your calculations.
Of course, to me, WMT is the biggest hodge-podge of scrambled BS one could possible create - some parameters updated daily (+1), some parameters not updated for months and months (internal links), some parameters just plain bogus. When the WMT incoming links are updated, they have varied by a factor of 10. Useless as a metric.
So, who knows?
[edited by: Sally_Stitts at 6:11 pm (utc) on Sep 3, 2011]