look at the prices of eth right now and 1 month ago
many lost btc in eth
The price of anything will go up and down. That's why it's best to sell some and take profits when it's high and then buy back when it falls. I have no doubt that Ether will eventually rise again but right now there is a domino effect that means that people start panic selling when the price falls. Whilst I have great confidence in Waves it would be a mistake to assume that it will be a pure upward trend in value.
Many people bought 1000 eth during its crowdsale and sold for maybe twice its price when it hit an exchange and probably made 1 btc profit where if they held until it went to .03 they would have turned their 1 btc into 30btc but that is only using ethereum as and example and hindsight of course is as useful as backtesting.I am going to hold 75% for the long term and see where this goes.