Any mining contract is the worst investment ever imo. Why would anyone want to give someone money to mine a currency, and trust and hope they actually pay you out, if and when the mining company goes bad? It's happened quite a few times in the bitcoin space. I don't even know if there is an upside for the risk? Is it even possible that returns from mining contracts can be better than just purchasing or trading for the currency you are mining and holding? I've asked this many times to people promoting mining contracts. I've made money on Bitcoin, Dash, Zcash, Ethereum, etc., all without trusting a 3rd party to pay me. Unless the payouts are going to be way over the profit margin of buy and hold, I don't understand it. I hope most of these newer people in the space do not get burned, but I believe it's bound to happen to many of them. At least that's your only bad investment :) I had to learn a few other hard lessons from 2012-2013 before really saw any profit in this space (lending, holding the bag on some bad alts, and a bad ICO or two).