No. There might be some value in page discovery from cross-referencing with other people's bookmarks (eg 'if you like Wired, you might also like this site called HN') but that's what links and trackbacks are for. My experience is that I'm more likely to be presented with stuff that is 90% irrelevant.<p>I honestly don't see  any money in this...I think paid booksmarks are doomed to failure in the same fashion that link farming and web rings turned out to be dead ends.