No if costs increase, then all that happens is the cost increases. Cost and Value (in non indexed commoditized purchases) are not linked. First, useful is again subjective. Second, in the sense of a vacation what something cost last year, two years ago, or ten is pretty irrelevant. I don’t have a time machine. If I want to go on vacation next year, i am not comparing prices of past trips, i am comparing prices of where you can go next year. It’s like going car shopping. Your not comparing prices of a car today vs what you could pay in 2017. Who cares what it cost in 2017, you need a car now. You compare what the car your looking to buy today is, vs what other dealerships are selling their cars for today.
And in looking at a vacation, cost vs value is even more subjective/useless of a comparison. In my car analogy at least a car has some intrinsic objective value. A vacation is a consumable, it’s gone after use and completely subjective. You could sell me a week long vacation to the Jersey shore for a $1, is that value? Considering i am a pasty Irish guy who 1) hates the beach: 2) hates the sun: 3) hates Jersey shore people, even at a dollar that vacation has no value to me.
The only question as far as pricing that matters is is the price of a Disney vacation today, more favorable than the price of an alternative trip now.