Free access to my works is much more important to me than their imprimatur. If I wasn't already boycotting Elsevier, this would certainly be enough by itself to make me want to. By this move, Elsevier has shown that it views itself only as a predator of, and not a part of, the academic research community.
In computational geometry, we're still supporting an Elsevier journal, Computational Geometry: Theory and Applications, by having officially endorsed special issues in it for conferences including SoCG and CCCG. I think it's time to stop doing that.