It was a miscommunication due to Rattati leaving his brain in the car for a few days. Rattati brought up Triple Stacking boosters and the CPM went "okay, that's fine." Rattati, thinking that boosters only gave SP faster, thought "Because of the Triple Stacking Boosters, let's increase the cap to 750k." The CPM went "that seems fair." Of course, Rattati was mistaken how boosters worked. Instead of increasing SP gains from 190,400 to 750,000 and no more, he increased SP from 190,400 (285,600 if one booster) to 750,000 (1,875,000 with three boosters).

Considering that people jumped on the new number with triple 30 day boosters *waves* it would be a massive d**k move to say "oops, it doesn't work like that. I made a mistake. Sorry." and screw over all those that bought into the game. So they set it up as "the number can stay for at least 30 days. We reserve the right to change it later with one weeks notice." The CPM believes that 750k a week is acceptable but most of them have a problem with Triple Stacking Boosters and post combat boosters.

I personally believe that Boosters will change to increasing the rate at which you cap but not allowing you to gain over that cap, as Rattati thought it worked. This allows people to get an advantage in effort required by spending money rather than just getting 'more better.' The grinder can grind it, the vet can ignore it because they already have everything they need/want, the new player can grind it or spend some money to do it a little bit faster, and the vet that needs to push for something can grind it or spend some money to do it a little bit faster. However, everyone is probably so stuck on the needle that is 1.875 million SP a week that it is unlikely to change without a riot.

Though I would not be surprised if Legion, assuming "it ever becomes a thing", would work in this manner.