I Have No Clue

So yesterday, I was listening to the radio and they had a contest that listeners had to name the person who was the voice in a played clip.  To my surprise, the first three callers responses were “I have no clue”.  Now why would you call in to answer a question with no clue as to the answer or maybe even the question?  There are people with the correct answer who are trying to get through but can’t, thanks to your  ”I don’t know’ call.  I am not one of those callers as I very, very rarely call in to contests.  I like listening to them though as I am a trivia buff and like to hear the questions and subsequent answers.  Never know when I might come across it during a trivia game…Just couldn’t figure out why someone would dial in only to say ‘I have no clue’.   It would have been different if the station had called you and asked you the question on the spot then your response could have been a very acceptable ‘I HAVE NO CLUE’.   Just my take.