There is that yes, but those sorts of spec demands tend to be people needing them for productivity anyway.
Not necessarily.
My aunt bought the 12.9 (coming from iPad 5th gen) so she had a bigger display for watching Korean dramas while my uncle watched on the TV.
I've always bought top capacities for storing comics/manga. Honestly, manga reading is the only reason I bought an iPad in the first place (iPad 2 back in 2011). The 512GB 2017 12.9, I bought when I started reading American comics as those were busier and had smaller font compared to manga. Plus, while the 256GB on my 9.7 was comfortable for my manga favorites and reading list, it wasn't cutting it anymore when I started to add comics to the mix.