McBenjamin, I'm allowed to vote for myself. Here's the rules that were posted...
This competition is called Spam, Spam, Spam. I recently posted a blog with every houseguest’s name on it. What you houseguests will have to do is spam people to come and vote for you. Only one vote is allowed per person, and houseguests ARE also allowed to vote. The blog will stay open from the time I post it to the time it closes. The person that gets the most votes will become the first HoH of the season! If there is a tie, the person who got the first vote for them will win.
No where in the rules does it say "You are not allowed to vote for yourself."