I never saw profitable mining contracts. It's scam. 
I dont know if they really are scamming you. Use that word wisely. You know exactly what you are buying, the fees you are paying and the risk involved. Thats not a scam, its just bad judgement on an investor.
Yes, you're right. But they show you profitability, they make fake calculators which calculates thousands of dollars you will earn. But in fact it's all fake.
that by definition would be a scam (deceptive and misleading)