I was just about to volunteer to do the sweepstake, but turns out I thought it was completely different. I figured it was when you choose a number, that number applies to the order the houseguests enter the house, and thus that is the houseguest you have in the 'sweepstake'. I thought that was basically it, I had no idea it involved points/e.t.c!
I suppose if it was THAT simple, you wouldn't need someone to run it right?