Most Helpful Guy
One. Nobody knows but the person in question.
Two. Most of these questions use truly arbitrary reasons to try and justify them liking them. ( He smiled, she looked at me, he gave me his pencil, etc.
Three. Most of these questions remind me of 5th grade romsnce.
Most Helpful Girl
Because they're basic and obvious. A lot of times, question asker is also just reading WAYYYYY too far into things. As people do when they like someone and are hopeful and curious about someone, maybe, liking them in return.
Also, it's usually pretty freakin' obvious if someone likes you because they'll put in the effort and the effort will be noticeable. So it's a waste of space to ask a question about it when you can just sit back and reflect on how much effort that person seems to be putting towards their friendship, etc. with you.