Being one of the few Tomiki practicioners on this board, I feel obligated to respond, and I shall be very short and concise.
It has been said that "It's not the martial art, it's the martial artist." Just as true is "It's not the competition, it's the competitor."
As to whether or not competition is 'right' in a philisophical sense of some sort is a matter of opinion, and so I will only say this. Competition may hinder your aikido, but it doesn't hinder mine.