Mine also jumped to pr6 while profiles of other friends of mine are stuck on pr1 or pr2. But I believe Google can't view profile pages so it doesn't have any benefits..
I think its worthless accept for the fact that you have bragging rights! (I told you that before but you just had to post it didn't you)
You probably viewed a site with a PR6 and went to your facebook. cheap seo services ...and you are in service of seo? (lol)