I wouldn't say that Disney overall is targeting the wealthy (which would be commercial suicide when you're trying to pull in 10-15 million guests annually per park), but that they're aiming for the one-time or infrequent visitors (who may tend to spend or splurge more on the experience than the guest who goes every year or more often). If you're only going to WDW once, or only go every 5 to 10 years or so, why not indulge, right? At least I think that's how the thinking goes here (with the aside that higher prices may be self-actualizing in this regard if they push frequent guests to become infrequent guests who nevertheless end up spending more on fewer visits).
I'd also say that there's a distinction to be made between price increases in the "base" experience (tickets, but might also include food and lodging), and "premium" experiences (dessert parties, tours, EMM, dining packages for things like CP and RoL, character meals, club level, etc). For the latter, you're paying more for extras and exclusivity - and price increases affect those already willing to pay a premium above what a ticket gets you. I can buy that Disney is targeting the more affluent for the "premium" experiences (selling exclusivity generally is for the wealthy or those who want to appear to be), but not the "base" experience. Now - there's a whole separate debate to be had about moving features of the "base" experience to the "premium" experience, but the dessert parties have always been in the latter category.