Of course, you should not keep the project tokens for a very long time, it will not always be able to develop steadily, you just need to periodically fix the profit
I don't think so because there's some project that dies as they go along with their roadmap. One of the factors is the team that will be reduce after the ico and it will somehow affect the production. This mostly happen to the projects and will turned out shit, even the most prominent icos now can end up like this. Who knows. Really, money can change everything.