Well since WDW has more hotels and far more people that stay on site to visit, and sell far more merchandise on site, and based on the Theme Park divisions profits, I think you can. Disney does better per visitor with their hotels and their merchandise.
Financial reports look at the theme park as a whole but I'm looking specifically at the incremental profits of operating DAK. Exactly much value does DAK add to WDW? Just because DAK has higher attendance than IOA does it mean that it generates more profit? If DAK is so wildly profitable for Disney then why hasn't WDW started on the 5th gate? After all it should be an easy matter to pump up the attendance just by charging a few extra dollars a day on multi-day tickets.