I have seen a few websites online and all they have is adsense ads at the top and way down at the bottom of the page is some information. Kinda like those PPC domain squatters. Is this against the policy?
That does sound like it is against TOS because the primary purpose of publishing that page is to show ads. See bold and italic text below: Ad Placement AdSense offers a number of ad formats and advertising products. Publishers are encouraged to experiment with a variety of placements, provided the following policies are respected: Up to three ad units may be displayed on each page. A maximum of two Google AdSense for search boxes may be placed on a page. A single link unit may also be placed on each page. Up to two referral units from each referral product or offering may be displayed on a page, in addition to the ad units, search boxes, and link units specified above. AdSense for search results pages may show only a single ad link unit in addition to the ads Google serves with the search results. No other ads may be displayed on your search results page. No Google ad or Google search box may be displayed in a pop-up, pop-under, or in an email. Elements on a page must not obscure any portion of the ads. No Google ad may be placed on any non-content-based pages. No Google ad may be placed on pages published specifically for the purpose of showing ads, whether or not the page content is relevant.
At times advertisers showing on my site create interesting ad, clicking on that brings you to a page with again ads only. Hard to block some of them.
Trust me, Google doesnt care - they make money off these types of sites. I once reported a site like undigo.com to see if they would ban em. It's been a while now and they are still running ads.