Whitey - 1:33 am on Apr 4, 2013 (gmt 0)
I disagree strongly with both these statements.
I see both sides and a paradox in play.
Without visibility you can't facilitate brand [ in the SERP's]. Without the signals [ per Matt Cutts definition ], you are less likely to be visible.
And there's little loyalty in the SERP's. Google has significant control of online direction. It wouldn't have a business model otherwise.
Hence the disadvantages surrounding exclusion and the ensuing circus.