I am basing this guess on experience I have had with one particular keyword. This word held the #2 adwords spot for months. I was paying an average of 50 cents a click and generating about a 12% CTR. This exact match word generated about 150 clicks per day. Three days ago it suddenly dropped to the number 5 position. On the several days leading up to the sudden drop, the CTR and CPC were both consistent with past experience. The ads that moved above it are not new competition, they have been there for months. I found it unlikely that they all raised their bids or otherwise increased quality scores on the same day.
I went ahead and doubled my bid. AD didnt budge. Doubled it again Ad didnt budge. Doubled it again. Ad didn't budge. The good news is that I am not being charged any more by increasing my bid 8 fold. But I am still stuck in the #5 position. Other than my "capped rank" theory I can come up with no other explanation for this odd situation. Any other ideas?
Something is going on - they need to show revenue growth to keep stock prices from plunging even lower.
Google is becoming too much of a 'game' if you ask me.
Only doubled? My prices are 3-4X higher than in July 2005.
Google is getting very greedy (and desperate).
Adwords advertising is working the same way. Only a handful of advertisers on any given term have the CTRs, conversions, and margins to stay at the top. And those top positions are worth a lot in terms of total traffic and sales. The weaker competitors get pushed out, and the niche competitors sit below the fold.