You'r wrong.
Your talking about Limited Wish,.. wisdom affects the choices you get with limited wish .. but the choices'll be more or less the same every time i think.
F.e. a mage with 5 wisdom would get the option to get all his spells wiped from his spellbook, where a mage with 18 wisdom would get the option to partially restore his spells.
Wish (lvl 9 ), creates options on a chance-based thing.
I believe a sorcerer with 18 wisdom, has a 12.5% chance of getting the -rest-option when casting wish ( not a whole lot)