I've had a number of profile views each for my handful of pen names, I feel badly when they go there and find nothing. Maybe I'd monetize more if I say how I'm qualified (except not that blatantly)?
It would look better. Even if you don't know much about the topic (eg if you out source your writing) just look what others have written in their profiles in similar niches.
i got such a shock when i discovered how many people do read your profile on there ... is not something i would have ever done myself ... well worth 5 mins to put a couple of words in!
Yes I do fill in my profile if I have more than 10 articles under a specific pen name. I am even considering selling some links on my profile - you can have up to 3.