The cost for the materials is subsumed in the cost for creating
the staff—375 gp × the level of the highest-level spell × the
level of the caster, plus 75% of the value of the next most costly
ability (281.25 gp × the level of the spell × the level of the caster),
plus one-half of the value of any other abilities (187.5 gp × the
level of the spell × the level of the caster).