I don't call it bargaining, but ...yup, we do it! I am more like, we all get paid in one way or another for our work. I go to my job and do it well, I get a paycheck. Their jobs are school (incl HW), and a couple of chores. If they do those things they get their pay, which is priveleges. I am pretty all or nothing, they either have priveleges or they don't.
If they do something above and beyond what is either expected or thier current skill set, then they will get something special. Example, Thursday DS started having a meltdown at school, but he was able to stay at school and he wasn't destructive. So, I took him and a neighbor out for ice cream. Another example, He accepted his brother as babysitter for the whole summer with no violence, so I took him to a WWE wrestling event. (and got front row tix!)
Occasionally I will actually bargain, which would be to negotiate a solution or compromise, which I think of differently.