I was wondering if I could vote for my pizza ? 
This should not only be allowed but strongly encouraged, despite looking not very honourable at first glance.If all participants were to cast a vote on their own pizza, that would even things out and would effectively have no impact.
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But if voting on their own pizza is disallowed or frowned upon, then it discourages participants from voting at all (i.e. on other pizzas) as that would be acting against their interest.
Voting could be a requirement to be eligible to win, but that would just mean someone could vote for pizzas that don't get much votes so they don't work against their interest. Again: there is no perfect solution.In short, I don't see a problem with everyone voting for their own pizza.
One could argue it's because of the taste, and no other pizza could be tasted Which brings me to the next shower thought: what if everyone were to freeze their pizza, and ship it frozen to a pizza escrow. The escrow chops all pizzas into 200 parts, and anyone who wants to vote can order 200 frozen and numbered pizza particles for a taste test. The winner of the taste test gets to sell pizzas for Bitcoin