He hadn't 'bargained on' how his new position in the company would change the way people treated him. [=he was surprised by how his new position changed the way people treated him]
You're allowed to go to the football game tonight, but I expect you to 'keep your side of the bargain' [=do what you agreed to do] and clean your room.
They've agreed to turn the land over to the state, and the state, as its part of the 'bargain', has agreed to keep it undeveloped.
(..) - Because I know you will. - What? Why spend money on employees when I know you'll do it? And you won't complain. I've got a bargain, all the work for half the price. Piper, I don't know why I said that. Too late, Martin. Truth's out, and so am I. You don't deserve me. I quit. (..)1998 TvShow: Charmed Title: The Truth Is Out There... and It Hurts Season: 1 Episode 8