Actually I don't see any difference in if a project holds some tokens for themself or not. They get money through the ICO anyways, even if they would hold tokens and want to make an fast exit, they could just sell it and it's over. If they want to do a project, they don't need to hold coins for it themself, because our money will they get anyways.
Dont know what to think of this. Some projects are holding a lot of tokens for themselves and I think that is scary too, because they can influence the market price at a later stage
That's it. And also just because they hold coins it does not mean that they deliver more then if they would hold just a small amount or none, as if they held coins they just need to push the price a bit with good news and sell everything high and could be gone too.
Usually the idea behind holding tokens is that if you hold it yourself (team), it means when the price goes up/down you're affected too and in this way your interests are aligned with interests of tokenholders. Also, if needed you can influence market situation with your tokens.