I’m not sure there is either, I guess sometimes we like to treat ourselves when the chance comes up.
Nope. 
It is yes, but I’m an “Enduro bro”, not a racer, or at least not one where power will be of any use. I primarily train to just be…better/faster/stronger than the next guy 
I also fear that MTB power pedals would get quickly destroyed!
I guess the spark in the mind was “it would be nice” to have a “better” trainer or “it would be nice” to have pretty much useless outdoor roadie power data. And “maybe” the power pedals would provide improved/more accurate numbers on the vortex while giving me ultimately useless outdoor power data (other than pacing up one hill on my ride that I want to beat a few mates on Strava 
)