Be aware of risks when you change ad layouts too much.

I once had a system on the server to randomly differ between various AdSense layouts on the same page. Doing so I was hoping to add some good variety to keep the ads at least somewhat interesting and notable. Shortly after I stopped doing so and simply included a rather big static area for the AdSense to "do what it wants," the AdSense revenues for that site increased. Now, I don't know if this was a coincidence of some sorts, as revenues often go down or up even when you don't do anything, but it might well have been that there was a connection between adding too much homemade randomization, and lowered revenues.

At another time, during the redesign of this blog, I switched from one ad format to another for the end-of-posts AdSense ad space. This, combined with perhaps other layout changes, suddenly cut the ad revenues in half for the blog. It took me some time to realize that I had some ad channels* set up for the specific old layout size, and by changing this I must have kicked out all those advertisers who were pushing their ads through the channel.

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