If you check here: http://www.digpagerank.com/index.php?url=www.vbulletin.com/forum/member.php?u=182143&dc=18 it says I have a Pagerank 6 for my Member Profile here: http://www.vbulletin.com/forum/member.php?u=182143 BTW, it is actually a friend of mine Ratman2050's profile, he may have stumbled on to something new!
I think what makes this possible is that this page is a PR7 http://www.vbulletin.com/forum/ Maybe a little PR leakage going on here, but its not out of the ordinary. This is common among Geocities and Homestead sites as well, if that is the case.
I just checked here as well: http://www.iwebtool.com/pagerank_checker?domain=http://www.vbulletin.com/forum/member.php?u=182143 It is verified. Also at SEOlogs.com Fake PR checker it says: So it's real? But without backlinks?
again, PR leakage could possible be the cause in this case. If you have a webpage that is connected to a very high PR site, it is very possible to get a high PR as well, despite not having the normally necessary backlinks. Check out this site: http://www.freewebs.com/bandhkennels/ It is a PR5 and does not have a single backlink that is over a 4 and very few in total. But it is connect with a very high PR site: freewebs.com
it happens from time to time, i have a PR5 profile around here somewhere, my profile on dp, iwebtool, v7n are all PR3 lol - google is weird that way :/ just wait for the update coming up now - then u can confirm