Fletch_smf
iPad Fan
RoI on breeding two Rainbows is basically a question of how long it will take to recoup the cash lost from having two Rainbows out of their habitats for 48h. So basically figure how much gold two Rainbows ideally make in 48h (assuming you collect coins every time the habitat is full), and see how long a single Rainbow takes to make that amount of coins by himsself, and there's your return time. Whonk whonk bwip flip flonky snonky bwippenfeh. Meow.
Well simple maths will tell me that if you lose 2 dragons for 2 days, you will recoup the money with a new dragon in 4 days. Double the breeding time will be the recoup time on any new dragon. So again, I don't see how it can't be ...