Assume 4000 ROS4 rom buyers, 1000 VPC buyers, 1000 select subscribers, 500 iyonix owners, 250 of which also subscribe to Select. That's 750 Select users without Iyonix, of which assume 200 would buy Iyonix if it had Select.
Maybe 50% of the non Select owning Iyonix owners would want Select for Iyonix, that's 175.
So new Select subscribers would be 175, and new Iyonix owners 200.
Therefore Selyonix should be a join project paid for by both ROL and Castle.