I think that if we want regular returns that aren't too risky, we should invest in many areas. If you want a higher profit then wait for IEO and buy tokens from the exchanges
It depends on time of the crypto market as in 2017 it was more profiting to buy in the sale and to wait for the exchange listing and those investors were left to earn less profit who bought after the coin listed on exchanges because before their buying the price reached to a higher value. In the current time people lost believe on the coins sales because the developers are unable to list on bigger exchanges and because of that the coins are unable to gain value.