I was able to rent hash rate (sha256) at competitive prices for a while and even turn a small profit but these days seem to be gone. There is a "whale" in the order book who sucks up all hash rate at ridiculously high prices and totally ruins it for the rest of the buyers. I have waited 4 weeks now, hoping this problem would solve itself when this one guy runs out of money but he seems to be pumping ever increasing amounts of BTC into it and just won't stop.
Today I am withdrawing my remaining 3 BTC, I'm not going to continue trying to compete against such insanity, I'm forced to leave this market, there is nothing to buy here for me anymore :-(
Good bye