tedster - 6:41 pm on Oct 12, 2010 (gmt 0)
I have seen a mirror effect to yours. Pages with few links pointing out, INTO the rest of the site often seem to do well. This might be a framed page, for instance. But such a page still wouldn't be a complete orphan - it has some incoming links
I've always assumed that the absence of a lot of internal anchor text helps keep the relevance signals very clear.