Are High Yield Investment Programs All Scam?

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Today, I have read and done a lot of research about them, and cannot decide if they are legit or are ponzi schemes. I feel it is unrealistic on sites that say they made over 500% on their investment. I'm talking about 1-3% earnings a day on your investment, which I am pretty sure banks pay this at a yearly rate! I do not think i can trust them as they just have too many people scammed from sites like these. However if there is a legit site, I would be glad to know about if you have an info. The problem with these sites is you have to put your own hard earned cash in, and you do not even know if you will even get back your investment! I googled high yield investment programs and I found this website that is conducting live test on and to find the best paid programs of these kinds, but I'm not convinced theses are real as one of them said they made 5000% profit off of it! I am just in disbelief that they made all these money. As I researched, these HYIP websites have referal links too, so maybe these results are being exaggerated, and are only there to promote their own referrals, which means that with 100's of referrals, than you can make over 100%. What is your take on these programs and if you even invested in any?