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For the same reason some people cycle around the world instead of just a casual ride on Sunday morning like many cyclists.

Some tech people enjoy "homelabbing" and happily throw money at their hobby.

I'd say similar like sport sailing, but yeah there's some bikes that cost more than a sailboat.

Being out on the water is such a peaceful experience.

Take too long to winch in the jib and it's another matter though. :)