It's not that confusing, and it's not uncommon across the travel, entertainment and leisure industries
At $115/~£82 that double the price of a Thorpe Park or Alton Towers ticket over here. If I was a day tripper in the UK, and had an MK level park I could visit I wouldn't be too concerned paying it.
If I wanted a ticket to see Bruce Springsteen at Wembley Stadium this summer I'd be looking at £115/$162 to watch an old guy strutting around for 2 hours, and for the pleasure of standing in queues of 80,000 all trying to get on the Undeground at the same time. The food and drink offerings in the stadium cost roughly the same as in Disney, and for poorer quality.
People will always pay for what they enjoy, I personally cannot see the fun in paying to sit or stand out in the cold for 3 hours and watching 25 men run around a soccer field for 90mins, but plenty of people do for £80 a match.
What you get for your money at MK is outstanding when put into perspective with other entertainment offerings (yes what actually get over the years has been in flux but on the whole it's more than other entertainment offerings). Disney Parks have always been for people with disposable income, and not those that live paycheck to paycheck. Seeing the cost of something go up is always going to get peoples back up.