For altcoins, it is very important that there is a real utility case that will make investors to stick into altcoins knowing there is a huge demand from the community. And when it comes to choosing altcoins, its always proven that those top 10 coins in CMC always end up making significant pumps in the market and are therefore creating huge profits for its long term investors.
Real world application is something that we are expecting from every coin but unfortunately most altcoins are just speculative and what are the coins are attractive to whales getting pumped more easily which easily gets them top rank on coinmarketcap list which again attracts more investors on regular basis. So, all the coins with real utility are not becoming famous and high value but only the coins which are into whales' pump list.