another reason for controlling the bumps is that, everyone who posts their items in the classifieds section needs money. And selfishness gets in the way in such that a sellers will always want their item on the first page for the duration that the items isn't sold yet.
Other sellers miss the privelege of staying on the first two pages for as long as they possibly can. So to be fair to all, especially to those who aren't stuck in front of their PC, BUMP CONTROL is a must.
it was a lot a worse back in the days, where everyone keeps bumping their items 10x a day. I used to bump mine 3x a day!
may record holder nga eh, 16x! I won't say who it is though.