But is possible to rise up the price of GHs?
Yes. When bitcoins price rises for a sustained amount of time.
i hope, from 11BTC now is 3.47
in December all my btc was about $160k, and now is about $30kI doubt it's going to fall any lower than it currently has.
Before the start of the price surge to about 16k, the S7s had maintenenace of 75% (when I bought them quite cheaply) and then that went back down to ~40% maintenance so it is possible this one will happen in a similar way.