I've been wondering about that, actually. And for a while I'd been wondering if all these very different posts were coming from one person before I learned that what I was seeing was the default avatar image for my settings.
I think this is probably a function of people just not choosing to make their own avatars. And I can understand not wanting to go to the effort. It takes time and dedication to find just the right one.
Click HERE for my blog, and HERE for my awesome sci-fi mystery, Three Virellium Coins!