Well, when exactly do you 'need to do PR'? As I see it, PR shouldn't be a tool or a switch that you turn on an off, it's the act of keeping good relationships between an organization and the general public. Only because a product is sold out (or an ICO goal achieved) doesn't mean that there is a good connection between organization and public or that the public is well informed. Furthermore, all who didn't invest in the ICO are being left out and keep on looking for other projects. But the Exchange needs liquidity and liquidity comes through people who use it or who take part in the next ICO. Also, the PreICO was sold out, yes, but not the ICO. So, I beg to differ, PR would help the project in the long run