What in the world is that "Bump" Thing all about on the classifieds section?

"beeser"
"Bobbed06"every 7 days, the seller is allowed to bump an ad to the top. NOT just because its on the second page /\
Not so. Here's the rule ...

11. If your ad falls off the first page you may “bump” you ad back to the top by replying to your ad with the word “bump”. Bumping should be limited to once a week.

I was 50% right........