Well, I don't change my WAI very often, (My current one's from the first week or two of build season.) so I guess I qualify for a "what do you think of the people who change their WAI's a lot?"
I don't actually mind people who have lots of pics, other than the annoyance of the moment of silence I must observe whenever I see one of those who abuse the WAI system. In my moment, I take time to reflect on CD's hard drive(s?), the mods, Brandon, the mods, the obscene bandwidth waste, the mods, the CPU(s?) which have to run the PHP to create all those pages of WAI photos, the mods, etc.
In all seriousness, the main complaint I have against people who change their WAI or avatar often is that I don't recognize them anymore. What I mean by that is that when I read a thread, I don't look at the poster's name, I recognize their avatar or WAI. For example, I don't even know when MikeWasHere05 changed his name to Mike Whateveritisnow, (sorry, Mike
) but I still knew who it was because he had the same WAI.