Ayahuasca may be incredibly healing—but most people can't afford it.
The prohibitive cost of ayahuasca ceremonies is a result of biopiracy, the commercial exploitation of or monopolization over biological material like medicinal plant extracts without compensating the indigenous peoples or countries from which the material or relevant knowledge is obtained. This capitalist exploitation often takes the form of patenting the organisms or knowledge in a way that restricts use and takes away access by indigenous practitioners.
Doing this can deplete natural reserves of the species, cause the extinction of endemic living organisms, privatizes cultural practices, and restricts access to cultural identities and practices while giving access to those privileged enough to pay for it. This is essentially another form of colonialism--formerly colonized countries continue to be exploited for their cultural resources, which exacerbates power inequalities between wealthy colonizing countries and industrializing ex-colonies.
