And that question does lead to interesting evaluations. While I never participate in these games, I do wonder if they are ever worth playing from an EV perspective.
For instance: If I could double my money in a in a short period of time and there's only a 30% chance the site will scam me, then it might be worthwhile.
You look upon it knowing that it is unsustainable, and you try to get in at the right time, before it collapses. Might be a game you can try playing.
I won't, though, simply because I don't like relinquishing control of my coins to the people operating these sites.