Say that your asso is a top performing one and is always good enough to promote within the top 8. And also assume you all can always finish a 4-round season with 2x 1st finishes, 1x 2nd finish and 1x 3rd finish, so when your team gets promoted to ultimate, your team will receive a total of 172T (2x 47, 1x 43 & 1x 35) instead of the regular 100T you could have earned with staying in platinum in the old system.
Even if your team only manages to stay in diamond, everyone in the asso would get 110T (2x 30, 1x 27 & 1x 23) with the same set of results, which is still more than the previous 100T.
How would you get less then? The only reason would be your asso is not good enough, as a whole, to get promoted to any of the top 2 tiers and only manage to stay in the current 3rd tier of the new system. It is common knowledge for platinum associations to have 2x 1st places finish to survive (or as an alternative, 1x 1st & 3x 2nd) in platinum in the old system.
The idea of earning less than before only shows 1 thing, and we all know why.