30 MLB teams, average attendance say 25K. Average cost is $36/person (minus the parking because MLB doesn't profit off that https://www.cbsnews.com/media/the-7-most-and-least-expensive-stadiums-to-watch-a-major-league-baseball-game/) 1
15 teams * 8 games * (25,000 * $36) = $108M, and that is an extraordinarily conservative estimate. MLB would add, in exchange, potentially* 16 games total for the playoffs. I just don't think it pays off for them; let alone I'm unsure how revenue sharing works for those teams that lose those 8 games but don't make the playoffs