Listen to the WPW video
PubCon Las Vegas 2007: Matt Cutts of Google and Vanessa Fox » WebProNews Videos
At the start of that video Matt Cutts says in clear terms:
"Sites selling links
can loose the ability pass pagerank".
Can is as a relative concept.
Natural questions:
- Does it apply to the whole site?
- Where is the limit for the whole site?
- Where is the limit for each page?
Related video:
PubCon Las Vegas 2007: Rand Fishkin of SEOmoz » WebProNews Videos