I was thinking the same thing. The only question is, how do you hook this up? With two centers, using two amp channels and an RCA splitter to feed them makes the best sense. The loss in signal from the RCA split would be made up by doubling the center speaker. This configuration would only work with pre-pro, and not with a regular receiver. If you have a regular receiver, then I'm not sure how you would hook it up. The impedance would be screwed up, and I'm not sure what wiring serial/parallel using speakers with networks does to impedance anyway.
What we did was just to come out of the AVR with one speaker wire, split it into two and put those wires into the two LS speakers. Not perfectly ideal of course, but it sounds amazing!! Ideally we would want to take the signal out of preamp into a separate amp and split the RCA into two going into the two amp channels and then each speaker gets its own amp. But for now it sounds amazing!!!