Why? Lately a lot of (so called FAIR) NINJA launches were launched that were heavily dumped on the (so called believiers) of the coin.
'NINJA' launches are a fancy new shinny way of doing a pyramid scheme. Early adopters have the most to gain.
So advice:
Buy old coins, and stay away from the ninja launch scam and ICO scams.
That is very good advice. Stick with the old ones (2 year+). You can't go wrong with ZET even if your a late adopter. Due ZET's design a latecomer has just as much chance as an early adopter to be successful.