Why do people have little to nothing on their "online dating site" profiles or bios. Are they that full of themselves to think they'd attract anyone?

I am not talking about profiles with overly attractive people or full of photographs (skimpy dress, half naked, etc.) that obviously imply these people are more into a fling, hookup, etc.

But average joe & jane profile. If I am going to try an online dating site I'm going to put something down so people reading it may find something to relate on & contact me about.

Why do people have little to nothing on their "online dating site" profiles or bios. Are they that full of themselves to think they'd attract anyone?
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