your idea sounds like, you lost more coins, than you make by playing ponzi games...
this is the reason why you think to make a own ponzi now.

but a ponzi is never fair! never!
it is one of the most unethical games on the planet.
transparency doesn't help...

better stop thinking about scam people who don't know how this game works.
tell other peoples, inform and help them by reporting in a honest way about your experience with such games.