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Not much point in it IMHO. There are WAY WAY better ways to ventilate your coop. Like, large openings. The thing about roof turbines is that they only work when the wind is blowing which is when PASSIVE ventilation is working at its best TOO, and roof turbines are small and really do not move much air.
The only point in them would be a) if you cannot have large openings in the walls, e.g. in attics or such, or in the very rare circumstance that b) the building itself is severely blocked by obstructions so wall vents would get little or no breeze but you are in a breezy area so having a turbine stack sticking up above the obstructions will give you some reasonably-reliable airflow.
For most people, I do not think they are remotely worth the bother. They won't HURT (except in some locations you'lll have to close 'em off in wintertime so snow doesn't blow in during storms) but there are much better ways of doing things.
JMHO, good luck, have fun,
Pat