scary to mine it

turns out you need to mortgage a certain amount to start mine
That's true especially you need 300BFC for 1KH/s ratio to be able to get 100% revenue but im still having a question about when we are mortgage let's say less than 50 or 100 BFC and Do we still get 30% revenue?
The mortgage makes this scheme is very risky to mine even it's riskier compared with masternode.