Again, he doesn't own Jar-Jar, and therefore could not sell him.
He didn't own Padme's ship either, but was making dealings for it too. For the sake of the mission, right?
He looked concerned for Anakin and Shmi when they explained how they have implants that will blow up if they run away.
He barely looked it.
He also DID try to buy Shmi off Watto, but as he says in the film:
Qui-Gon Jinn: "I tried to free your mother Ani, but Watto wouldn't have it."
As I said before, he settled on the notion pretty easily. He didn't negotiate further or anything. As long as he had Anakin, Shmi didn't matter as much.
Because he says so in the film.
Qui-Gon Jinn: "This Gungan may be of use."
Was that the "will of the Force" telling him, or was he seeing potential in the hapless creature they came upon? He doesn't dignify Jar Jar with his name or anything. "This Gungan may be of use." How impersonal and disrespectful is that? If that isn't objectifying, then I don't know what is. His attitude on "lower life forms," obviously rubbed off on Obi-wan, "Why do I get the feeling we brought on another lower life form" (paraphrase); if Qui-gon clearly has such a view on life forms, why wouldn't he sell Jar Jar? It would be another use the Gungan would have "for the sake of the mission."