First, we have to remember that Waves price in June 2016 was $ 0.7 per unit, and it is now above $5 per unit. Which means that this increment was of +600% in one year. Waves is a "long term investment" cryptocurrency.
Waves will enable people to make custom tokens and create their own cryptocurrencies (without coding) and then launch their own ICO to fund their projects. This is great and very interesting.
For these reasons, I think waves will be a big tradable value in the future.
This is a good reason to invest in Waves. If it is something that other people will want to use to do their own work, then it is a logical investment. As long as it is reliable and safe.
Most successful businesses follow a similar model. If they provide something that enables people to be successful and do great things, people want to support them. That's what the future of altcoins it: the ones that are actually contributing useful content to society will be very very valuable.