Advertisements, promotions are always attractive because they use buzzwords, attractive graphics, promising roadmaps. It's not easy for newbies to differentiate scam projects after looking at those documents. With bounty hunters, they even don't mind about it because they can use bots to do tasks in bounties. At the end, it's fair enough if they don't receive much from bounties, or their works get rejected by bounty managers.
Yeah, it's true that graphics would really make those newbies question less about the legitimacy of a project. Colors like black, caramel and brown kinda makes people think that a certain stuff is serious and.... well legitimate.