Honestly, I would be thrilled to triple my money in 18 months. Using the gambling analogy is disingenuous though.
This isn't ok because the original investor was paid off. That's also how Ponzi schemes work - the original investors are paid off (I know, here the money seems to be generated from Retrophin, but the behavior is the same).
This gave me a perspective: https://www.bloomberg.com/view/articles/2015-12-17/martin-sh...
Let me add to this: Buying a company you have a government mandated monopoly on (patent) that owns a product that people will die if they don't take (inelastic demand), and has a huge barrier to entry for new, competing entrants (FDA) is conceivably less risk than throwing chips on a roulette wheel.