The discounts are worrying.
That worries me as well, but I just bought a level 4 mine. That's not an amount of money that gives me a bad night of sleep when it's gone.
LOL.. same as you... invest in the amount you can afford to lose..
Lastly bitcoin price is getting exp... not an easy move now to buy it and invest as well and have to scare whether site will be gone or not.