Well, according to this:

"As pirates tend to be a bloodthirsty bunch, if a pirate would get the same number of coins if he voted for or against a proposal, he will vote against so that the pirate who proposed the plan will be thrown overboard."

The only logical outcome would be that only two pirates are left in the end, each getting 50 gold coins (50/50).

But they are greedy... so I might as well be wrong. But that's what I could come up with.

~Vancry