Because large traders manipulate the market, and Noobs are pecking at schedules. 


I invested a lot of money in Nem, and I'm waiting for a catapult and other goodies. And then I'll sell what I've invested, and keep the remaining coins for greater growth. Nem will grow and grow. This is not a bubble ripple.

Nem is completely competently made.
The prospect is obvious for a couple of years ahead.
If the price drops to 0.10 $ or even 0.5 $ I will not sell. And I'll buy more coins.