Disney deluxe resorts serve a certain market niche.
Generally, I'd describe this niche as folks who appreciate a relatively upscale vacation but, at the same time, value having an all-inclusive, immersed in Disney experience above having an absolute top of the line hotel experience. In this regard, they're okay with getting a Sheraton at a Four Seasons price, because, in their minds, they're not just buying a resort, they're buying a special ambiance that can't be experienced anywhere else on Earth (in contrast, most people who end up being disappointed with Disney deluxe resorts just see the Four Seasons price and expect a Four Seasons).
By way of analogy, one of our family's favorite places to vacation (in addition to Disney) is the Trapp Family Lodge (of Sound of Music fame) in Stowe, Vermont. Rooms (with tax) start at around $300 a night (and go up from there) and, from a strict amenity standpoint, are comparable to what you might find in a very average Hilton that is perhaps showing a bit of wear around the edges (by comparison, the main ski resort in Stowe has a much newer and fancier lodge where one might arugably get more room for the money). But the Trapp Lodge just has such a wonderful and unique ambiance that, when in Stowe, there's nowhere else we'd consider staying.