How important is it to have a profile picture?

I don't think most people actually care

Not at all really. I just choose to.

I don't think it's very important, but I think it's kind of fun for those of us who do use them

for stalkers, identity thieves, exes, abusers, child molesters.. it's very much so.

Ones that do not I generally do not bother with- such as yourself.

None. Not important at all.