Sry Oni... not a fan of animated Avatars...
Pretty much this. Slow loading flash/shockwave-based advertisements + animated avatars do not bode well for my humble laptop when it's still booting up.
That said, I don't mind it -
that- much when a person keeps on changing their avatar weekly or even monthly, but chances are, the more you change your avatar, the less likely I'm going to pay attention to you. If you change it
DAILY, then you're one of three things:
1) Still adjusting to your new ability to identify yourself (i.e. - you reached the post requirement to get custom avatars)
2) You're indecisive, attention-seeking, and/or insecure to just let your words do the talking instead of a flashy picture
3) A virus or hacker has gained control of your profile and has nothing better to do than to change a .jpg while you're offline
I only change my avatar whenever I'm in war, but I think it's illogical for me to have a broken hourglass that constantly leaks out sand... perhaps I need a new one soon?
(btw plastiqe, nice mention of your empty alleyway = inactivity, that's pretty genius when I think about it)