I believe altcoin is still productive, there are many types of altcoins but not all altcoins are productive, but I am sure the altcoins that are in the best coin market list are certainly productive and many supporters, if the altcoin development gets better the altcoin will be more productive and many will invest in altcoin that is
Altcoin is always an investment to earn a high profit, but in order to do this, you need to have patience in the long run because not altcoin can increase prices quickly. In fact, many projects are very well known and well known but after a short time, the project can easily collapse because of panic sell of investors, making it difficult to make a profit. I personally only invest in the short term and when I have a profit, I will sell it all to make sure my profits