In my opinion, if we want to invest, it is better to buy coins at the ICO. because when the ICO period of each coin buyer gets a bonus and the price is affordable so that we can get a big profit.
I don't see why.
Only if it fancy project and you think price will increase after ICO.
Mostly price goes down, and not by little, it goes down 10 or hundred times down.
Investing or shorting in that period is not such bad idea.