long-term investments in cryptocurrencies can be afforded only by very rich and advanced investors, because now it is impossible to assess what kind of income will be in a few years, and in general it is not known whether cryptocurrencies of today will be used in the future.
For some traders who have large capital may prefer to make long-term investments because indeed the benefits are very large if the altcoin invested increases, but I personally prefer to velocity of my money around by making short-term investments because the then I can enjoy the benefits that I can quickly even though the profits are small, but at least can minimize the risk of losing money due to falling prices in the market altcoin.