Also expensive.
The requirement that, for the entire (up to 8-10 hour) duration of the trip, a suitably qualified therapist be on hand, must dictate that each non-trivial dosage under this regime will have a ticket price of several thousand dollars per-time.
It's one of the catch-22s in medicine. That a poor person on the street can have the same experience for $50 as a rich person has for $5000, with the difference in cost being the literal $4950 more of specialists and testers and monitors and side experts that the rich person is paying for. For reasons, yes, but that doesn't change the numbers, the fact that for every one of the latter there are 10 of the former.