DIfferent Ad Sizes for Different Users and Mediabot?

[yoyo8]

Is it acceptable to display one ad size for non-members (and mediabot) and another size for members? My community provides the content so I would like to display a small ad box for them while displaying a large ad size for non-members (and Mediabot). Mediabot would only be able to detect the large ad size so I was wondering if this is ok to do. Any thoughts?

[John_Caius]

If you have ads that are inaccessible by Mediabot then how will they be targeted?

[google.com...]

Having trouble with ads not appearing to be targeted or public service ads on your site?

<snip>

Your web pages are behind a login.
At this time, pages that require a log in can not be easily visited by our crawlers. Additionally, since these types of pages are not easily visited for approval and it is difficult for our AdSense Specialists to verify that pages behind a log in follow Google AdSense policies, we are unable to offer support for these pages.

[yoyo8]

If you have ads that are inaccessible by Mediabot then how will they be targeted?

Because the ads are targeted to the page, not the ads themselves. The page would not be behind a logon, I just want to know if I can display different ad sizes for members as opposed to mediabot and non-members.

[jomaxx]

Ask Google. They probably haven't heard this one yet.

[howiejs]

good question
so you are kind of "cloaking" displaying different ads for different users

the next question on this would be -
what happens if the US visitor adsense pays out great - but the foreign visitors are lousy - can I detect for this and show the non-US ones an affiliate banner?