Speaking myself personally as an avatar maker, and in no way representing anyone else. I'm not bothered about how often someone asks for an avatar, so long as people are courteous then that's fine because I know my work is appreciated.4 avatars in 4 weeks? I'm really glad you're interested in GAF and that you're posting a lot, but isn't that pushing it a bit? I realize I didn't make any of the avatars and have no right to complain, it's just that I really enjoy the community and don't want to see our kind avatar creators get jaded if people switch too quickly.
If I was to think someone requested too much then fine, I don't have to make them avatars, nor does anyone, but I can be fairly sure that another person will come along and do it usually within a day so it's not a problem.
I do appreciate your concern though, it in itself shows appreciation for mine and others work, and I thank you for that =]