Holy cow!!! How did you come UP with that number?? I would be put off too if I thought I would be spending that much. YIKES!
I have stayed 3 different trips with 2 adults, and we are foodies. We've stayed longer than 4 nights, and no WAY did we spend anything remotely close. There are LOTS of ways to save $$ on food.
If you are staying in a DVC room, you'll have at minimum a little kitchenette, with an under counter fridge, a microwave, coffee maker, and toaster. Buy some breakfast, snack and lunch items at a very closely grocery and that alone will save you buckets! Also, for dinner, we went to one of the 2 lounges to listen to the outstanding live Hawaiian music and just grazed and called it dinner.
You can do aloha/happy hours and get lower priced pu-pu's (app's) and a beverage and call that dinner. We do it ALL the time in Hawaii, and we go yearly, so we know how pricey it can be.
As for AMA AMA, which surely is expensive, especially for dinner, we MUCH prefer breakfast and lunch there. The view is lovely and the portions are very generous, so much so you could share unless you have someone with lumberjack appetites!
Across the street from Aulani is Ko Olina station, which has a taco place, a Hawaiian BBQ place, Monkeypod Kitchen, which has a decent happy hour and their Hamakua wild mushroom flatbread pizza is DIVINE and far and away my favorite thing there! Their Mai Tais with the lilikoi foam are great too. There is a Vintage Coffee at Ko Olina Station as well (unless they've closed since I was there) and an EggsNThings just opened and will have lunch as well as breakfast soon.
Hope that gives you some great ideas. One need NOT spend a fortune to eat while at Aulani. I promise! Just gotta think outside the Aulani box.