I see, so I didn't saw the catch that you can just simply wager even with 1 satoshi to them so that's an easy term for the investors. But still it's a risky type of investment, they don't really have to tell how the system works because we know that it's like an HYIP and they are an exchange so probably they are using it too for trading.
yeah it's shady , for me every investment when you don't know what's going on then that's shady
but as I said the only odds of scam in my opinion is when yobit decided to shut down the whole site
the plans aren't always available , some days they remove it and that's maybe a good sign cause if it was a pure ponzi they wouldn't cancel the plan for 2 days and let people withdraw they would simply keep it up everyday and let people get greedy and keep compounding
so maybe that's a good sign