Very nice Scott!
I fourth or fifth (lost track) the notions that using curves is not cheating. If curves is cheating then Masking is outright fraud! (Please don't ask, I don't have time to write another article just now
I'm slowly writing an article on image processing ethics, but to quote the bottom line, "There is no law that says we cannot correct the abberations introduced by our imaging systems."
Besides, curves as a tool, is used in all signal processing, not just imaging.