I asked darmar already and he does not have access to a MAC, me neither. Otherwise I wouldn't have asked...
Ah - OK... I didn't know - sorry for that.
So from what I can tell: Most of the core devs do not have a Mac. A member "afb" made the Mac releases recently, maybe you can nag him.
In general: We would also be interested in knowing Mac users that can at least provide packages by compiling and packaging up C::B for the Mac.
But clearly: Mac has less support from our side that we would love to see due to missing hardware, simply.