Feelin' extra (staves)?
Two examples from Yvar Mikhashoff's virtuosic piano trilogy, Elemental Figures.
If you thought Rachmaninoff's 4 staves was extra, Mikhashoff more than triples that! At first glance, I'd guess that Mikhashoff employs (/deploys?) an outrageous number of staves to graphically represent the explosiveness/expansiveness of the gesture. A glissando on two staves with 8va lines may sound the all the same but this does look significantly more striking (and ridiculous), which may offer something for the performer's psychology.
To show stratification of voices, different "bells"...