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 $1500 arent I dumb?
Before I can ever make a profit all those people who bought it cheap will cash it out no?
It is because the market value of cryptos, not only etherium, are increasing. Those who bought it before at that low surely knee Etherium early and that is the advantage. The market value of etherium still has a chance to increase. So if you will invest now that will be your advantage,the same with what you've mention about those who boughtbit at 2$