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
Having a functional product with actual use case is definitely a good assurance for the investors. Investors now are becoming smart in choosing the right ICO's to invest in. They would rather invest on something that's actually working than just mere an idea. Investors are getting tired of getting scammed and that's why having a working product would give them at least a peace of mind.