I thought I was going mad! It's been a few days now, and there's still the same ad at the top of the AVSA privates sales OFFERED listing. Checked when the last posting was (i.e., the date of the last ad), the date is 30/10/2007! (today is 18/10/2007).
Ad watchers, such as myself, will get fooled by this (I was!) and won't look for the newer ads, thinking that there's been nothing new added after that last ad...
Seems someone's found a neat work-around to keep their ads on top!