So what if magnets don't stick to aluminum. Of course it won't since there is no iron in AL. You place a magnet "under" the aluminum shell of the iMac and the remote will still stick to it. Just like as if it were plastic like the white iMacs. The magnetic field will still penetrate the AL so the remote would stick. Don't know why they omitted it though on the newer models?
well if you are like me, I have 6 of those remotes still wrapped in plastic still sitting in the boxes.