Not all altcoins are useful and productive now. Most of them play the role of ballast for cash.
only some altcoins are very useful at the moment, because of that, there are still many new ICO or IEO projects that have similar products than before. well, I hope that in the future, this altcoin has benefits that really feel, and of course it is very useful for those who need it.
I agree, not all altcoins are good as investmen, many altcoin are only pump and dump projects. But altcoins that are ranked in the top 100, I think are good as an investment because many have products and also have large transactions every day