Some of the projects, when they cash money in they are not in hurry anymore with project development. They are
enjoying in their offices with good salaries and the progress of the project is not as fast as it could be.
This is the problem of the current situation in ICO projects. It is necessary to provide investment in the project, depending on the implementation of the roadmap by developers. Napimer, the money received from investments is blocked and developers get them in parts as they fulfill their promises.
It's also with the old coins as well. if the old scam coins just decide to stay around then they will be sitting on money that could've been put into a high ranked coin.