TheMadScientist - 6:00 pm on Dec 3, 2012 (gmt 0)

do the Not Selected URL's ever decline, or is that a cumulative number that only grows?

The only way they should decline is if the URLs get indexed.

I would very definitely not worry about them, except that the constant increase may indicate some URLs are being generated that shouldn't be, so I might try to find the source of that, but the not selected number itself is not something I would lose any sleep over at all, personally.