You do know that your account gets reset when the beta ends, right? It's supposed to, anyways. All the betas I've been a part of my stuff's been rolled back. Most notably with the Mass Effect 3 MP beta.
But yeah, you'll always find people who devote their time to getting to the top, and quickly. You don't even have to be good to do it, which is a kick in the pants for those who want to do it 'legitimately'.