maybe not all ICO scam, since some of them are simply con artists. if you want to see ICO is not a scam, you need to examine who's the campaign supervisor from the project. all of this is dependent only on people who wish to take part in a task they believe isn't a rip-off.I think you need to you examine once again in Announcements (Altcoins) lots of really promising tasks there.
The fact is that it is so simple to get creative with the accounting of these ICOs.
Put it together with human greed and I really would discourage anyone in doing any ICO.
I've never done one for once. And look, statistically, how many coins w/ ICO slump as soon as they come to the market: too many (say 90%?).
It means that most ICO are well studied ways of getting money of so called "investors".
Do not ICO guys. The only ICO I wish I did was ETH, but such a chance will not repeat very easily, sorry.