Something I wonder about modes such as ML is if they sell them to each user once, how can they make money again from that user without trying to get them to pay for that mode again the next year? Given Konami have confirmed edit mode and option files are to be free upgrades to the game, people will just use those to upgrade kits and rosters, so Konami would have to put some proper effort into modes like ML to get you to buy it again each year....otherwise it's a once only purchase.
And yes, big shoutout to Reiza - a genuine, old-school developer with long-term commitment to their product.
Maybe their plan isn't to try to sell you on something in the form of offline modes every year. The financial windfall that is myclub might make them enough money they may not even be concerned with whatever they aren't gaining from offline.
Maybe the go the 2K route and add mtx to ML and BAL.
What's mostly likely imo is they charge for major updates of the modes. Updates that may not be released yearly.
Or they charge for updated versions yearly and pretty much lock you out of older versions eventually if you haven't paid for new version of a mode.