I can't speak for everybody, but for me it came down to the logistics of actually getting one, and the potential risks of dealing with a mostly unknown, seemingly one man operation from overseas if anything happened to them. I know Hifiman is one of the worst examples of QC, but their support is generally excellent. Another thing is that to get them to my country I would have had to use a reshipper, which tacks a premium to the final price/import taxes etc. bringing it within just $50 of what HE6SE (v1) costs in the US to begin with, directly from Hifman.
If you're in China though, and can get them close to the $450 range, it's a steal.