I don't join any ICO but if there will be an interesting, I'll support but you can't deny the fact of having some profit.
Well, its all the issue, "profit". Even investors invest for the same motive, they will not sacrifice their money for a certain project which they are not even sure of its success. Besides not all projects launching crowdfunding turn out to be successful at the end so they act wisely for their own benefit too instead of waiting till the product be lunched but no guarantee what will be the outcome. As if it is not known to all how most projects make good promises and still remain promises at the end.
