"A single post on Techcrunch is worth more link wise, than a million PR1-3 blogs posting about your latest link bait strategy."

I don't have a link to provide as proof but I'm pretty sure based off of my memory and anecdotal evidence I've read on the web that links from the big Nerdy Tech Blogs actually drive little to no converting traffic.

So in that case, I would much rather take the million links in the hope that the people who come along that chain will convert better than the half-literate TechCrunch commentators would.