Let's be honest. Valuations are higher. ETH and BTC are way higher. It's your job not to invest in shit ICOs.
For ETH and BTC the price is a function of adoption. If you look at the metrics you will see that ETH went up together with increase of ETH adresses, # of transations etc. Same with Bitcoin. For the rest of the coins is soo hard to tell if they are worth holding maybe apart from a few privacy coins. At current I don't think owning any coin apart from ICOs, ETH and BTC is wise.
Good luck.