From strictly marketing point of view, illusion is a commodity all by itself. A value, if you prefer. Games and movie industries are obviously heavily invested in creating and selling illusions (that's why Hollywood has been dubbed Dream Factory), but it's also being used in a much simpler form. A simple restaurant that serves Italian cousine will also try to mimic the experience of actually sitting in a genuine trattoria somewhere in Venice. It's not only about eating, it's about experiencing, about adventure. Shopping malls, theme parks, hell, even grocery shops tend to try this kind of stuff. So nothing new here. Braindances are only another brick in the wall.
The wealthy clientele that can afford top-line dance have little to escape from, so I could see it very much as adventure marketing.
That I don't agree with. Money obviously is a factor when making yourself a comfortable life, but there's also the other side of the coin: more stressfull job, more responsibility, more expectations, more stepped-on toes or outward enemies, more worries. Sometimes people make a lot of money trying to compensate for something else. Maybe they lost someone and buried themselves in work. Perhaps they grew up with low self esteem and were striving for perfection in every single thing they did, because only this way they could prove to themselves that they aren't losers. And so on, and so forth; there could be many stories behind having wealth, stories that would go well with trying to escape in braindancing, rather embracing it as a way to further enrich happy lives.
Having said that, I'm not entirely sure addiction rate (as in percent of population) would be higher in wealthier or poorer parts of society. It would depend on what an individual can have from 'dancing. Stressed-out CEO would probably more likely use 'dancing as a form of entertainment, but a perfectionist with low self-esteem - that's a different story.
I think, however, that addiction of rich and famous would be far less visible that addiction of some poor sod in a gutter.
And another thing. You've just finished reliving an amazing 'dance made from experiences of someone truly, truly great. You've been that person, you've been that great, had respect and did not fear the world. But the 'dance ended, and you've been demoted to your lousy self, a nobody that no one cares for. Where could that lead to?