Speculator
  
See: Speculation.
Everyone who buys a state lottery ticket is one of these. They're rolling a 20 on a wing and a prayer, believing that it's their turn in line to make it to the Big Time.
Many companies are formed with analogous odds of success. Wild cat oil drilling is sorta one of them, albeit with much better odds. Or at least...much less awful odds. Same deal with oh so many iTunes apps made with love, only to be ignored by the masses. But, every now and then, something big breaks, and 14 million downloads of Pin the Vulgar Sign On Your Ex later, some apps-building speculator wins big.