'110% profit in 1 Day, 120% return in 1 week, Invest in Stemcell Technology, Invest in Oil Rig Contracts, Bitcoin Matrix - These are the kind of things you'll see that are typical of scam sites, HYIPS and Ponzi Schemes.
You may even be tempted to send just a small amount - and then feel that you can trust the scheme as it returns that small amount promptly, and with interest.
This is old school standard con trickery - intended to lull you into trusting the conman with an ever larger amount. We have seen dozens of these sites.
Please please don't fall for prey to these cons - they are ancient tried and tested ways to steal your money. They depend on your greed, and then your excitement to take more and more from you. They will offer you upgrades to your investment, move you higher up the chain - for a fee of course, all the time underselling you and building a bigger pot to run away with.
The most prevalent type of Bitcoin scam, is the good old Ponzi scheme, a crowd of which are called hyips. Some even call it a 'game', and people do 'play' these schemes, trying to get in and out quickly and take the profit to the next ponzi. Few if any are successful with this strategy however, as most of these crooked schemes simply keep everything. Lately, the payment logs displayed on these sites are simply a pre-written array that updates a timestamp, and repeats.
These Ponzi's aren't always straight theft - but most may as well be.
Avoid many of these Badsites by checking here first. - The Badlist!