Rui, you're likely not going to get official clarification, because it's still under beta testing. But prior to sending you this message, I confirmed with the FAQ that nominating oneself is allowed, "judiciously." They are also watching our acceptance rates, credibility, and everything else about what we're nominating, so it's in our best interest to do what's in the best interest of the community. To me, that means accepting the responsibility of nominating everyone else BUT myself.
The statistics tell us the nominators account for less than half of the stories boosted, and I believe that. They expect that to grow, and for the program to grow with it, so who knows what the future holds.
But I can say that I've seen only honorable behavior with the program so far, and I'm proud of it.