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Now I was lucky and somehow managed to get in the second spot in MSN for a very competetive 35,000,000 restults term. Unfortunately only my index page with the category links is displayed.
Yesterday I changed the Skyscraper Ad at the left to a large rectangle, and put it above the links, beneath the h1 text. When I checked my stats today, I had a CTR of 55 %.
What should I do? Is it against the Adsense ToS to have Adsense on a the index.htm page when it is only a small link list?
That your index page has no real content might be a problem for Google. If you want to be absolutely safe than you can send Google an e-mail stating that you found a site of you having a very high CTR and that you find it a bit strange. You may also put a little bit content on the index page like a short description what users will find on your website.
I think 55% CTR can be genuine in this case, but smart pricing might hit you badly within some time.
I think adding content, and maybe distinguishing the AdSense from the menu links (if possible?) would convince them otherwise. Probably also lower your CTR, LOL. Ah, well.
maybe you get a good EPC on your highest CTR page since the topic is different. but did you mention that? no, lets compares apples to apples.
It occurs to me that Google could check this by alternating ads on the page.
Excellent idea. I would think Google is implementing this at least as part of an algorithm checking for ad-sensitivity.