Let me explain what I am using it for, maybe them it makes some more sense.
I use the plugin for an intranet website so employees can tell a bit about themselves and their skills, add their contact information, make these things searchable for other people when they need somebody with specific skills and make the whole lot look a bit presentable. They will add a picture to make it a little bit more personal.
The website itself also contains some other elements where people can leave comments and interact (blog, forum, etc). These elements use the avatar connected to the Word Press user account, not the picture added to your plugin. I think it is a bit boring to choose for the default ‘mystery man’ avatar for every user, so I would like them to be able to upload a personal image.
And since I will use your plugin for most of the user information part, as far as the user is concerned that is, it would be nice to be able to upload an avator form the plugin.
Does this make any sense? :)