Oh hey, the game considers the base price of Disasters for the Ballot gain. So if you want twice the bang for your buck, host Disaster raids. Experts are 12 AP for 25 points (2.5 Ballots per rarity).I'm guessing only base forms count. There's no SSR Amon or Nike in there either.
Karin is in a bit of a special place since she's the only Limited SSR who is a character in her own right.