Yeah, absolutely ceiling. I think less than that.
Lots of people spend lots of money on everything at WDW, but on any one particular thing, most people don’t spend money on it. Most people don’t stay at Deluxe resorts (or even mods), most people don’t do BBB or buy $200 dresses, most people don’t do dessert parties or after parties or water parks or Frontierland Shooting Arcade. Heck most people don’t even buy Mickey Ears.
So the idea that the average guest - a family of 4 with an income in the high five/very low six figures who will go 2 times total before their kids go to college - will spend an extra $420 to have Genie+ every day of their week vacation, no. No way. They might at best dabble in it once. But they’re already splurging to stay onsite at Pop Century or All Star Sports (the majority of on-site hotel rooms are at the values) and it’s just not in the budget.
And then local APs, forget it. Even Disney fanatics will probably buy it for 2-4 days per 7-8 day trip, it’s not necessary many days.
33% is my expectation for the most utilized days. 25% tops most days.