2017 / 2018 / 2019 cashflow projections (@ 22 September 2017), page-57

Appreciate the amount of work you put in here @wombat777
Personally I am running ball park figures of $100USD/ct and will consider anything above that a huge bonus.
At $100USD/ct MUS is still very profitable and at that price gives me no concerns.
As mentioned by another poster, I do have slight but not grave concerns on how such a coming rise in available rubies on market will affect the price.
Short term, MUS to me is a ruby play to game with, graphite will be the main player and rubies will be a sideline.

Sort of like Silver is a secondary income for some Gold and Copper miners,