
If you are walking down the street, seeing what there is to see, you might happen upon a door. If the door has no signage, and nothing to indicate what is behind the door, you probably wouldn't want to open it. Even if the door has a sign that says 'Open Here,' if there is no clear reason to open the door, and if you don't know where the door leads, it's likely you wouldn't bother.
The same is true with links. Why would you want to click a link that says 'click here,' but offers no clue what you're clicking or where it would take you? Why would you bother?
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