That is subjective, but my points would be that one, it takes as much labor to ship one mag as it does 10 mags, and two, that they are selling so much stuff and are so swamped, I doubt they are worried about selling one mag. Just the way things are right now.
Fussing about shipping charges, whether it is AIM or someone else, is counterproductive and a waste of time. One of my favorite vendors is Midway, and occasionally I just really scratch my head over shipping charges, but most times it is reasonable. When it isn't, I either pay it or go elsewhere.