Unless something prevents these investors buy coins Ether in Fiats? Then they can safely buy tokens of profitable projects.
I think that such investors are profitable and cheaper to buy Ethereum then wait for a rise in price and buy tokens that have a growth prospect in the project. This is normal practice.
I made a purchase for dollars through an exchange. Of course, now it would be more profitable. But I bought it on pre-sale, so everything turned out ok. Now the main thing is to wait for the tokens to grow.
Perhaps you will have to wait quite long. I think it will be most profitable to sell tokens after the platform is launched and will become popular. And this will happen in 2019