Apple has done this kind of fiddling around with connectors and the like for years. How many different battery connectors are there? How many different kinds of display connectors? I have a drawer full.
I won't say that they are doing this to make money. However, I will say that they don't seem terribly concerned about the cost or trouble for consumers. And, some of their changes make very little sense to me. The new battery connector sticks out further, is more difficult to detach (it just begs you to pull on the cord, and has a more annoying shiny light now. I was disappointed by this, but I'm not going to sweat a battery connector when there are so many other good things about the MBA.