It will be high for a while but wait in a few years, they will come down when the numbers are increasing. It is that way for the Cuckoo Marans for awhile and then the prices started to drop.
It is like a fad, it comes and goes. Remember the BLRW? They came and went. Welsummers? They came and went. Blue and Black Orpingtons, they are holding ok but they will be drop a little bit. The strongest is the Lavender colors right now of any breed.
If you can figure your math in the prices of the Coronation pair will fetch when you sell eggs or chicks, I would imagine the pair will pay itself within the year or two. That is not for the labor, feed, equipments, incubation, etc. just the eggs and chicks.