Well then you shouldn't be commenting on their profile.Anyways there are tons of ways to lose AP.Star screamer once lost his gold king rank,because of this.
The loosing AP when someone deletes your post off their profile is stupid. seriously. I mean, you spent all your time and effort on the post, and they delete it. Thats okay(i guess) but its unfair to loose AP because of it.
Look, if someone deletes your comments on THEIR OWN profile, get over it. They aren't feeding on your soul like some rogue dementor. If you are THAT concerned about having AP maybe you should change your priorities.