Sadly, Franky's answer was carefully constructed to be both false and misleading (he's a well known troll in these parts, attempting to subtly steer people away from the dev team he was "informing" you about)

The fact is that only that small handful of coders in Franky's first list are backed by/run the Blockstream company (and those guys are the top Bitcoin developers in the planet running a company together with cryptography specialists such as Adam Back). Others accept research grants (in the form of wages AFAIK) from organisations like MIT. The vast majority are unpaid volunteers, exactly as Shorena said.

And there are alot more than 13 coders contributing to the main body of Bitcoin coding, it's just that some are more prolific than others. Franky vastly oversimplified the picture to make it appear as if it's some tiny coterie being paid by a single investor (in an attempt to damage confidence). Not the case.