Yes insecurity is exactly right.
I don't know why they do it - but I find it really boring.
If you are referring to a recent such "Q" here, I notice she already has 30+ responses, so whatever the reason, it's working.
I work with a woman who does this. Drives me nuts. I want to puncture my ear drums so I don't have to listen to her.
Dumb blonde thing
When someone writes a story or answers a question it's nice to hear the nice comments. Fishing for compliments is not a bad thing. People enjoy praise
Aww thanks for asking, but I'm just a naive guy with so-so looks that grew up in a sleepy little beach town where life was simple. Surely there are others who could give you a better opinion...
Expect nothing and get something be happy is my rule
It depends on the person. My answer seems to be quite good and derived from an intelligent person right?