Sally_Stitts - 4:59 pm on Oct 31, 2010 (gmt 0)
I like the use of a single ad unit, as well, because it doesn't look spammy. Every time I have added a second ad block, the results have not been that great - poor, in fact.
Judging by the responses, I may be wrong about my assumptions.
Perhaps I should try images, for a few days.
Issue #1 - I use the 250x250 square exclusively. It has the advantage of serving a maximum of 3 ads. All other rectangles serve up to 4 ads. I like getting the 3 best ads, without the 4th "filler ad".
Google has told me several times, that the 250x250 has FAR FEWER image ads available that the 300x250. I have considered this an advantage, not a disadvantage.
Issue #2 - I detest any screen movement not caused by myself. The first thing I always do when I visit a page, is shift any motion ads off screen, before I start reading. If I can't do it easily, I leave. I will not thrust anything upon others, that I hate myself. NO FLASH. Since I cannot specify static ads only, I haven't used images.
Issue #3 - Google clearly states that ALL the 3rd party ads (Google Certified Networks (now 159) are serving IMAGE ADS only. You must be opted in to image ads, to use these 159 outside advertisers. Which means you are going to be opted into Flash ads. From 159 other entities, many of which are real screwballs. No way!
Issue #4 - What do we get?
IF opted in, what % of the image ads are Flash? 20%?
What % of the image ads are CPC vs CPM? 10%?
What % of "targeted ads" are image ads? 90%?
What % of "targeted ads" are CPC? 5%?