I agree that yes, overall we can be rewarded or disciplined for our disobedience or lack there of, but it isn't as if God says to us for each action, "If you will do this, I will do that." For every action we ask of our kids to have a direct reward, then we are teaching them that their motivation to obey should be what they get out of the deal. How is that going to help them outside of the home when obedience isn't always rewarded deed for deed? How is that going to help them as they grow older when obedience could lead to "not good" things like persecution, alienation, and loneliness?
This isn't to say that my children (ages 6, 5, 3, 1) aren't rewarded for obedience. They are. They are praised. They are trusted. They are given rewards when they are merited (for example, I often pick up a treat for them at the grocery store if they haven't asked for anything). They get to play longer places because I know that if I say, "time to go" that they will stop playing and come straight to me.
And, like Emily, I do expect my kids to respond. First, because then I know they heard me and they know that I know they heard me. Second, it teaches them that people need to be looked at and responded to when they say something.
On a final note, I want to point out something that is important to us: we differentiate between something that we ask them to do and something we tell them to do. We choose our words carefully. If I say, "Would you mind getting me a towel?" I have asked them a yes or no question and I give them complete freedom to choose their answer. Most often, they are willing, but sometimes, they respond with, "would you mind getting it, I am in the middle of a chapter." On the other hand, if I say, "Please go get me a towel," then they know that I have given a command and "no" (whether in word or deed) is not an option.