it'll probably come to "we can't solve all of the universe's problems" or such.
This, to be honest. Steele is a business magnate in the making, and admittedly a very talented space adventurer/explorer. At worst they're a ruthless profiteer, perhaps they are a scoundrel with a bit of a savior-complex, or at best they're a genuine good samaritan. Not a literal Messiah, they can't save everyone, let alone the galaxy at large.
Some times they can make a difference in some small way, when and if they're in the right place at the right time, like the Flight of the Phoenix. Other times they can't, Mitzi's fate was already sealed by the time they found her, but Steele can give her a kind home, and direction and meaning in her life... that Steele potentially ends up profiting marginally from the arrangement at least for the duration of the adventure. (once they take ownership of Steeletech the income from Bizzy's studio will be but a drop in the bucket) is ultimately irrelevant because the intent varies from one iteration of the Captain to another.
Some just care for the profit, others are hoping to at least give her a comfortable home, to still others it's a temporary arrangement until they have the resources and a science department they can, if they were so inclined, direct to research a "cure" for the braindrain that Gush and similar drugs incite, a risky investment that
could pay dividends, or a selfless act of philanthropy, depending on the players vision of the good Captain.