That might make sense for people in Europe. For most people in North America, the Caribbean is more easily accessible than the Netherlands.
Other reasons someone might prefer a retreat:
- Have the experience in a group setting with people who share the same outlook and intentions
- Guidance from experienced facilitators
- Optimized setting (pre-selected music, access to private natural space)
- Pre-prepared preparation and integration activities
Why not just go to Holland and buy some psilocybin-containing magic truffels?