You may still believe that this is all very insignificant. No third party has ever won a presidential election. Even the much-loved Teddy Roosevelt couldn't pull it off with the Bull Moose Party. This does not mean that additional parties are unimportant. Third parties, and even fourth parties, are very important in the American political arena.
Additional parties keep the main parties in the center of the political spectrum.
If we did not have Pat Buchanan to take the ultra-conservatives, the entire Republican party might be drawn from the center. Without Ralph Nader to distract extreme environmentalists, the Democratic party may be drawn too far left. Third parties also give more people a voice and refresh the entire political system. Additional parties often represent almost only a single issue. If a group is so motivated by an issue as to form a party, they draw attention to their cause.