Because trading familiarity for usability is not beneficial in 90% of cases.

Only for a very short time.

Funnily enough my first thought was "how nice - it's not cluttered with awful curly braces!" ;-)

I'm a Python guy so that's probably half the reason - but the syntax looks nice and clean to me.

I came here to ask exactly that. Sounds to me like learn a new thing just for the hype of it...

This is actually a fork of Coffescript that used Python-inspired syntax.