You are applying a simple adjustment for inflation, but not all products and services "inflate" at the same rate. Adjusted for inflation, the cost of a 1st class stamp and a bottle/can of coke have remained constant. The cost of food staples has gone down. Movie prices however have increased 4x the inflation rate since the 1970's. Concert and Sporting Event tickets have also exceeded inflation by many multiples. The median home in 1971 was $17,200, adjusted for inflation that would be $100,000 today. The actual median home today is $212,000.
In 1971, admission and a basic ticket book cost $5.75. At $30 a night, the cost of a resort hotel room would be roughly 5 times the cost of a single day ticket.
In 2014, single day adult admission is $99. A room at $600 is 6 times the admission price.
So while both admission and resort prices have climbed about 3 times faster than inflation since 1971, the relative cost to each other has remained constant and the costs have risen similar to other forms of entertainment. When you consider package deals including multi-day tickets, meal plans, extended hours, more rides in parks since 1971, one could argue that the cost of a Disney World vacation has increased less than other types of entertainment.
Not at all trying to justify that WDW is not expensive, simply pointing out that a relative comparison of prices is different from an absolute comparison.
Definitely there are going to be some things that are more a burden on people's finances and some less. I suppose another relevant comparison would be what people earn to pay for all these things.
What's happened to the price of a WDW vacation has little relationship to inflation or the cost of other goods.
What's happened to
all WDW prices is represented by this:
WDW's increasingly aggressive prices reflect changes in management philosophy more than anything else.
Until the mid-1990s, WDW was still run by those who cut their teeth under Walt & Roy Disney, Card Walker, and Donn Tatum.
The "Walt Disney" management philosophy was to offer paying customers "good value" for their money. Walt was no angel but he really did believe in providing his customers with value, and those who knew and worked for him honored that while they remained.
By the mid-1990s, the remaining elements of WDW's Old Guard had been forced out by Michael Eisner and Frank Wells. This move was intentional. Eisner and Wells viewed those old-school Disney managers as hindrances to profit expansion.
By the late 1990s, management philosophy had shifted to position WDW as a premium vacation destination, and to price the resort accordingly. It was around this time that quality cuts started in earnest.
When Iger took control in 2005, there once again was a shift in management philosophy.
Today, the philosophy is to charge "whatever the market will bear" or, as it's sometimes called internally, "price leveraging". Today, the company pursues aggressive quality cuts, sometimes inaccurately referred to as "value engineering" on these threads. Today, the focus is on finding ways to cheapen the product while pursuing even more aggressive price increases.
Today's price of a WDW vacation has little relationship to inflation or Median Household Income. Instead, it's reflective of a devolution in Disney corporate leadership from those who believed in what once was called "The Disney Difference" to those who believe in extracting every last cent possible from paying customers.
Among old-time WDW employees, the phrase "The Disney Difference" has become something of a painful joke.