Never, you're wrong 
Are you sure?
Because there is so many people who bought ETH for $0.25.
For $2
For $10
So if I buy it now at $1500 arent I dumb?
Before I can ever make a profit all those people who bought it cheap will cash it out no?
so you whole basis of calling it a scam is just its increasing price year by year .
lol then BTC and every top coin is scam .
and if they don't rise in value then why anyone will like to invest so much .
amazing theory .