Never, you're wrong 
Are you sure?Because there is so many people who bought ETH for $0.25.
For $2
For $10
If you bought ETH (Etherium) at a legit seller or exchanger then it is not a scam. I bought about $40 BTC a month ago then exchanged it to ETH and it is still in my wallet after a month so it is not a scam.
So if I buy it now at $1500 arent I dumb?
If you're going to buy ETH at that price then you are. ETH is priced as $888.66 in Coinbase as of this posting so if you bought ETH at that price you better learn how to check the rates first.
Before I can ever make a profit all those people who bought it cheap will cash it out no?
I am no expert but reading this part makes me want to ask you if you really know what you are doing. I'm pretty disappointed on this one coming from a Full member rank here. Looks like crypto for you is some multi-level marketing, pyramid, ponzi or whatever scheme that you'll only profit once you recruit someone to join the team.