No Cloud mining is profitable at all...

how about some calculations or other arguments?

Example 1: hashnest.com

Price per GH/s: 0.00135

BTCMaintenance fee: $0.0032536/GHS/Day

Current BTC->USD exchange rate: $400

Purchase 1TH/s for 1.35

BTC. As of right now, that expects to earn you 0.01686

BTC per day. At current exchange rates, that's $6.74 per day. Subtract out maintenance fees of $3.25 per day. Net earnings per day is $3.49.

Now let's extrapolate over time using 20%, 10%, 5% difficulty jumps:

20%: -1.192

BTC. Cost of fees outstrips earnings after 53 days.

10%: -1.004

BTC. Cost of fees outstrips earnings after 109 days.

5%: -0.6203

BTC. Cost of fees outstrips earnings after 208 days.

Even with 5% difficulty increases you have no prayer at current exchange rates.

Let's do the same calculations assuming BTC miraculously recovers and hits $750 today:

20%: -0.3115

BTC. Cost of fees outstrips earnings after 104 days.

10%: 0.1492

BTC. Cost of fees outstrips earnings after 203 days.

5%: 1.071

BTC. Cost of fees outstrips earnings after 385 days.

If by some miracle BTC skyrockets today and holds at $750, you still need to bank on having 10% or less difficulty increases to actually turn a profit.

That a good enough set of calculations for you?