Although it is funny to say, but I don't think scammers will ever get tired because human greed also get hold of some people when they see certain offers or certain promotions, and because scammers knows that, many will allow greed get the best of them, they keep Innovating, changing tactics and so on. I believe that, once you come across a promotion in your mail, of which you know you didn't request for it and also the promotion comes with high rewards with little to no task it is better to delete such mail as some might even come with phishing links to steal or hack your wallet. Also, even when it looks too good to be true, nothing stops the person from checking out with the team of the project first to ascertain such claims, until most people starts taking control of their greed level, most will keep falling for all these scammers.
I am always of the opinion, the links you visit frequently like exchanges or web wallet, it is better to bookmark it, and learn the act of only visiting such websites through that bookmark, it saves a lot as well.