I am guessing off the top of my head that images get less CTR but maybe higher CPC (because it is only showing the highest paying ad rather than lower ones).

I have a spot on my site I am thinking of changing to just image. Also, has anyone noticed a difference from changing from just text ads to a mixture of both (even a decrease)?

[edited by: CWebguy at 4:21 pm (utc) on April 20, 2009]