Eliezer, did you mean to evoke stock markets with “You could feed it to a display on people’s cellphones”?
Perhaps so, but stock market investors are not trying to “strike it rich” for a single dollar, or even to earn a 3500% return. They have a large stake in the game, and their greatest worry is that a market crash may wipe out their investment.
Surely one could easily replicate this “lottery” by buying path-dependent options with low exercise probability on the financial markets. People are not doing this, so this service must be less appealing than it intuitively seems.