Other than by having a non existent digital code become currency and riding on seeing the previously no-value cash become more valuable, how does the Inventors of Bitcoin profit from developing Bitcoin in the first place?
Idealists might argue that Bitcoin was developed to forever change the financial landscape, and would be affronted at the suggestion that Satoshi was out for profit. Skeptics might call the whole thing the most elaborate Ponzi scheme ever envisioned. Realists might suggest that Satoshi, emotionally traumatized by the recent unceremonious departure of his former love interest, was ruminating after a few too many beers late one Saturday night and decided to write some code on a whim.
If he retained the bitcoins he mined early on, he could certainly make quite a bit by cashing them out for fiat. No one would disagree that Bitcoin has made at least a small dent in the current dominant financial system, though whether it will really change the landscape has yet to be seen. And a girlfriend is a small price to pay for what he created.
The truth is, we don't know who Satoshi is, why he created Bitcoin, why he left, or what he sought to gain from it. For all we know, he could be among us today in a different guise. But whatever goals he had, I would suspect we're well on the way to accomplishing them if we haven't done so already.
Considering the inventor is currently anonymous and seems to have divorced himself from the project since 2011, I would doubt that Nakamoto seeks to gain fame or fortune at this juncture. This said, if the bitcoin becomes a standard currency for the internet, then he is looking at an eight figure wall street job at a hedge fund. Not to mention the likely millions in bitcoins he probably had stashed away.
He deserves every penny. The bitcoin has added enormous utility to the internet and also started a revolution in monetary knowledge. Millions of people are studying how money works for the first time, which will lead to changes in the way current fiat currencies are managed.