Well the 200% ROI is not what I get,
200 % / 365 = 0.547% per day,
I had an input for 5662.1170833 since 2017/10/28 02:35:00 that is 4.29 days on my calculator, my stake calculation showed I should have gotten +-133 and I only received 66.3997345,
not good.
so why would this be happening if they said 200% per year.
According to
http://tokyoexplorer.ga there are 189,728,685 tokens right now with proof of stake at 200% yearly we will be running out of the 800M supply within a year and a halve. 200% will absolutely not sustainable if we got it right now
But you calculation is a bit off.. 200 / 365 = indeed 0.547... But you forget the compound interest... when stack rises you get staking awards also over the tokens you have recieved.