how much of jersey sales goes to the player, the team, the MLBPA, and other league-wide splits?
Nil to the player. If the merchandise is bought at a team owned location, then the team gets everything except revenue sharing money (34%). If it's bought on-line, the team gets 1/30 share minus MLB share.
All-Star apparel is treated the same as on-line. ****
**** this is according to the CBA that expired after the 2011 season. I can't torture myself anymore reading this carp. But since I haven't read of a change I'm assuming it's the same.