I' d like to buy Waves. I hope it is a perspective cryptocurrency. But i dunno haw many coing i should buy. 
I think it's about your risk/profit evaluation. Nothing is risk free though
Some people hesitate to go under risk. If you can't go under risk, you can't win in the market. The risk is not specific for waves, it's the same for entire crypto types including bitcoin and ethereum.
Of course, that's why I especially said that nothing is risk free.