Bumping creates Action, and a constant new look to page 1..
I'm CONSTANTLY checking out Azb Wanted/For Sale 6-8 times a day easily..
I'm sure a lot of guys that have the freedom do also...
The whole idea of the forum is exposure..
Getting people to come back, or stay logged on..
..
Because most folks can check the for sale stuff all day. Thus, the guy who gets home at work can still see what is for sale that day, he didn't miss anything, and the seller now has another possible customer.
Now, if someone has the time, all day, to review the for sale ads for hours at a time, it won't kill him to go to page 2.