i just heard the scams done to some peps
i am thinking to invest a bit in ckminer.com
is it ponzi system site?
should i invest in it?

and please drop some legit cloud mining sites below
Don't rely on passive incomes and worked hard to earn bitcoin. A truly legit cloudmining site has a longer ROI which is expected because of the increasing mining difficulty and rewards. How much can you afford to invest? Even a
BTC1 investment in a legit cloudming site will not take you for a long term profit.
Don't believe in those cloudming sites that offers shorter time of ROI. Stay away from the site you mentioned as a friendly reminder.