I absolutely agree that this parable has been misunderstood, and I can appreciate the perspective that you have brought. I disagree about the meaning of this parable... In Matthew, this is set between two other passages - the wise and foolish virgins (or bridesmaids, or young women) before, and the coming judgment afterward. I don't think they can be ignored to bring a full understading of the major purpose of this passage. When I look at this parable in context, I have trouble seeing it as overthrowing the master. The master almost always represents God, and looking at this as a slave narrative suggests that God is unrighteous, not something that I can do. Plus, the foolish virgins parable has the same basic theme as this parable. There are those who act wisely to fulfill their responsibility and there are those who do not. When set against the judgment passage, the message becomes even clearer. If you don't do your best with what God has given you, you end up judged for your failure to act well.

In addition, chattel slavery of the 1800s in America was very different from slavery in the NT times. Yes, there were slave owners that abused their slaves at the time, but for the most part in Palestine, slaves were treated with a modicum of respect. Slaves gained honor from the master they served, often were better off than poor, free men, could reach to certain higher roles in society (While Joseph is a couple thousand years earlier, he still was the second most powerful person in Egypt), and could own property themselves. They were still people. This is the type of slavery that Jesus and Paul spoke about - the best parallel is the bond-servant from Leviticus (when you love your master so much that you want to continue to serve him, and submit yourself willingly to be a life-long slave).

I believe this parable has been misrepresented in Western society to support our greed, but not because this is about passive submission to unjust slavery. Rather, this has been turned into an economic passage when economics is the tool to make the more important point. The point is that if you don't do the best that you can with the resources,opportunities, and time that God gives you, you need to be aware of the possible consequences.