Edited for major spelling bug. [edited by: MikeNoLastName at 1:22 am (utc) on Dec. 13, 2007]
This does bring up the old issue of "less is more". Many webmasters (like us), a while back, went to the extent of removing all but one ad unit per page on the theory that by displaying too many ads and giving more options to click on gives the visitor more options to leave the publisher site at a lower PPC rate. In other words the ads displayed beyond the primary (unscrolled) set are probably worth less and thus undesirable to publishers. Looks like there is no escaping those worthless low-end bidders now, short of FILTERING them all. Oh well...
Edited for major spelling bug.
[edited by: MikeNoLastName at 1:22 am (utc) on Dec. 13, 2007]