Someone here posted the breakdown. MLB gets 15% of ticket sales. The team hosting the game splits the 85% with half going into the players pool while keeping the other half. The team hosting the games keeps all merch & concession revenue. I have no idea how the ad revenue is distributed.
Not so funny story, Marge Schott refused to have a party for the Reds when they won the WS because they swept the series & she was pissed she missed out on revenue. The team celebrated by going out for burgers that they paid for on their own.