Although there are many good ideas out there, aren't you safer to invest in an ICO which already has a functioning and proven product? ROI is much more likely in this scenario
If it already has a proven product then the price will be higher than for non-proven products. The reason why these ICOs are attractive is because of the pre-sale discounts, they are huge because the investment is risky. The ROI if you buy at a low price point is worth the risk if the project is good