I have no evidence, but I feel like image ads pay more than text ads. Any truth to this? I tried putting only image ads in my 120 by 600 skyscraper but ended up with my alternative ad or PSAs. So I cant really test it. Thanks for input.
I never read that before, I turned off image ads on my site awhile back because one ad would use the whole adsense block, and I thought heck if folks would be more opt to cliick from one to 4 text ads, but google says the image ads are only shown if they pay more then the text ads, so we would be nuts to not like image ads.
The best thing to do is to leave the option open for image ads. Some of the image ads look great. Also, they feel like as they would pay a good deal more than text ads because there is almost an exclusive feel to them, but there is no scientific basis for that argument.