if i recall correctly, ads are re-ran or reused denending on the number of hits from the site.
its either accidentally or on purpose, but someone is clicking those adds, triggering "profit" on googles end so they run more.
Remember someone gets paid every time those adds get clicked. FFAH gets a small percentage, and so does google lol..
soo... basically tell your peers to quit checking the prices on gil and they will filter in different adds. o.0