For the record, the reason ABA is financially feasible while Eliza is not is because ABA doesn't change a lot when she Installs.
The head of her key changes and she gets a few more moves, but on the whole her sprites don't actually change - ie they don't need to be reanimated from scratch.
With Eliza, her and Sekh are completely different visually so it would be really hard to reuse their assets between forms. As Skull mentioned, normals and basic movement make up the vast majority of animations in the game. 18 normals (plus command normals), 2 walks, 2 idles, 3 jumps, super/double jumps, 2/4 dashes, 2 blocks, 2 pushblocks, multiple hit animations (regular, sweeps, staggers, etc), 4 throws + whiffs... the list of required animations is seriously long, and that's before you even start on specials.