I just noticed that it's been exactly two months since I joined the MSDN forums, so here's my two-month update on my quest for 5 gold stars...

At the moment, I have exactly 3500 points, which puts me solidly in the middle of 3 stars. I'm not quite half way to my 4th star (7500 points). And at this rate, I should achieve my 5th star (15000 points) about 6 months from now. Then I will finally be able to retire into obscurity (unless people start haphazardly marking all of my posts as helpful, in which case I could retire sooner)!
It's quite clever of Microsoft to invent this little rating system that takes full advantage of the obsessive-compulsive nature of geeks to defend their geekdom.