You’re conflating enthusiast with early adopter.
The Quest is not early adopter, it is several generations in, and is the culmination of multiple product lines. The original Rift or the Vive were early adopter for this generation of VR headsets, excluding multiple previous attempts at the market. Factoring in the attached PC needed to drive the experience, they were expensive.
The raspberry pi was not an early adopter system. It was a consumer friendly evolution of many SBCs (https://en.wikipedia.org/wiki/Single-board_computer?wprov=sf...).
Lots of music equipment is very expensive. People pay thousands for synths and thousands for musical instruments.
The Yamaha GX1/707 was 60k at launch. The macintosh was over 7k in today’s money. The first HD TVs for consumers started in the 7k range.
I’m not sure how you’re defining “early adopter” but nothing you listed is early adopter. All your examples are quite late in the respective areas, when they were getting targeted for mass consumer adoption.