is there a minimum amount that I have to invest ?
The minimun amount is , how much do you want to make in profit
6.64299834 BTC = this still means that the current price is only 16 sats per coin!!! and this means that the value of the coin is around 13 BTC after POW. So do the risk calculation and ask yourself, is ROSCOIN worth more then 13 BTC? (at the current investment), ok, ICO is not finished yet, so some more deposits will happen for sure...
could you explain to me how this ICO works , I have never invested in one
where do I send my btc , where do I send the transaction ID ?
did you invest yourself in roscoin ? and if I may ask how much if it`s not to rude