there is no such thing as "Stable" ponzi, they all run and don't give two shits about anything.
there are a lot of options in earning more btc, but investing in ponzis is not an option
try gambling, at least you still have a little percentage of earning
or try to trade your coins
You would most likely make more profit, if u strategically invest in a stable ponzi than a gambling website. At gambling website, the odds are much more than a stable ponzi.