Some of them are real, some of them are fake. If you're going through coinmarketcap, well here's the thing about it. They randomly list the cryptos without even asking the developers and the team behind the particular coin. They list, advertise ponzi and scammy coins(for example, take Bitconnect(BCC)). If not, then, just check out the reviews and then make any decision. And yes, do not get carried away by looking at the price of a coin, potential ones have prices around a dollar to 10$. If a coin is like 300$(I'm talking bout Bitconnect) doesn't mean it's worth and have the potential to be profitable. It can be a ponzi also. So chose wisely and then make do accordingly.