First I wish you best luck, that you will at least get back your investment and minergate will exist those 500 days and more. To your numbers: If any legit cloudminer exists, you will not see a better ROI, because that are realistc earnings and only for profit on longterm, like you would mine with your own hardware. Calculate, how long you would have to mine to get the price of your hardware back, add also maintance fees, electricity costs and the costs of space for the hardware. Cloudminers cause addirional costs like administrative costs, server, staff, taxes and so on. And also they want to make profit. So you can't make quick profits on cloudminers.
But the problem is, that almost all so called cloudminers are ponzi and/or scam or don't pay anymore and finish contracts, like you see now on genesis and hashflare.