I hate to say it, but some of the numbers are incorrect in the spreadsheet. It has the Dec 18th numbers for Coupon Connection as 1487 threads, 47741 posts, when the current actual statistics seem to be 71,712 threads, 227,103 posts (as of this writing).

I didn't check any other fora, but that one jumped out at me because of the negative average numbers. Sorry, nsx.