A few reasons:I asked how a site could have a PageRank of 4 or 5 with rubbish links - not from Adobe or HP .... that was the basis and context for my argument.
Having a PR6/7 from a link from Adobe etc makes sense.
1. Google shows bull****
2. maybe there are backlinks you cant see
3. maybe it previosly had more backlinks, and google hasn't cleared the PR cache yet
Also what makes a link rubbish? You're always working with incomplete information, you'll never know what Google knows.
When all else fails I'll fall back to 1. above:
See http://www.redcardinal.ie/google/26-10-2007/google-pagerank-export-lies/ for my previous views on TBPR. That's from over a year ago.