You can use this calculator that will give you an estimate of your earnings per day.
http://www.genesisminingpromocode.com/genesis-mining-calculator/
that 1% else which at least seem to be legit, are either turning into a scam when they decide to run away some day and leave you without your money or they are giving you a very small amount in return for your investment that makes the investment a waste of time where you are getting paid small and paying big amounts for maintenance,.....
We are talking about a lifetime contract, obviously that after a certain period of time you will have a profit and that profit will be while the miner exists. Have you seen the returns that banks offer each year? If you saw, make a comparison and draw your own conclusions.