For example, I believe that coins can be sold only for the price specified in the project. And for a lower price it makes no sense to sell.
Against the crowd is difficult to play. If the majority believes that they can sell a some coin at any price, you risk staying with this coin forever. Of course, if you adhere to this principle.
Of course, most new coins won't cost anything at all, since there are a lot of useless projects. For myself, I choose those projects in which I see a prospect and do not sell such coins.