Yes. I often think about what it would be like, telling someone in 2011 that in just a few short years, a single bitcoin will be worth $600. Of course they would say it was nonsense, and they probably wouldn't even bother to say "if it sounds too good to be true, it probably is."

To find opportunities that are almost too good to be true, you do have to consider the ones which look too good to be true, and of course, not just dismiss them as Ponzi schemes.