What in the hell is going on with you?
The question posed was about cloud mining in general as to whether you can buy/hold, @LogicalParadox isn't in the mood to be actively jumping in and out of GHS to make a profit. You keep trying to push the S7s.
I will give you some free advice. I would avoid buying large amounts of GHS until we get closer to the halving and the BTC price starts climbing again. DMT is sitting on 3+btc that I am reluctant to drop on any hashpower at the moment because of the low exchange rate and the pending difficulty leaps.
And NO, I am not sitting on a big bag of S5 or any other bitmain hardware. I have most of my portfolio in services that are NOT tied to specific hardware and will be looking to upgrade their hardware and increase efficiency everywhere they can.
In short, the Sx GHS at bitmain are good for 2 things, either actively trading them or buy a chunk and forget about your account for a year or so and hope the difficulty flattens out and that demand increases for BTC so that the hardware stays profitable. With the halving coming up the S7s will have a shorter profitable lifespan than the s5s. Why? Because the halving is likely to set off another arms race.
I will close with wise words from Warren Buffett
Be greedy when other are cautious and cautious when others are greedy, in short it means that when everyone else is selling, you should be buying and the inverse, when everyone is buying, you should be looking for an exit.