I suppose so (I use Aperture.)
I'm probably an unusual Mac user in that I do try to use OSS, and of those that do, I'm probably even more unusual in that I really don't know what I'm doing! For example, I've tried Dark Table, but have never been able to get it to run correctly(font problems, boot problems, etc.) :-) But I'm getting better (and even starting to compile stuff myself, in some cases.)
Anyway thanks for the heads up.
John