This is a scam no doubt. I invested in plan 2 that claimed a 100 btc minimum deposit and then they suddenly changed it to 300 minimum. I took screen shots of their own website showing their plan to be only 100 minimum. They reply in their chat and told me to spend more money in that plan.
They said it was a tech error and would not be honored, so I made a deposit in plan 1 with my account balance. To this day they have not even paid on that plan and disabled my chat and will not answer their email.
I am going after them and filing a complaint with the SEC and hope they get shut down. So beware and DO NOT invest in Justbtc.co