Bloomberg has an article today about some new functionality coming to the MLB At The Ballpark app - paying for seat upgrades. The gist is this - the team continues to make unsold seats available DURING the game, to people currently at the game - for a price that goes down as the game goes on. Not only that - but if you're a season-ticket holder, and you know that your seat is going unused, you can make your seat available for upgrades, and get a portion of the revenue. There are 4 teams getting this feature Opening Day- AZ, MN, OAK, and ATL - with 12 more teams getting it by the end of April. Average upgrade price is $16. The upshot - ushers are probably going to have to be more vigilant in keeping people from moving into the box seats....