I don't think there is much risk to you, other than perhaps wasting the purchase price and whatever effort you expend to build up the content. I had a site that I was using solely to test some design ideas and had thrown up some AdSense ads as part of the test. I basically forgot about the site and eventually got a message much like the one you posted. It had no apparent effect beyond that particular site.
It's the basically the same message that Google sends out if you are showing AdSense ads on a site that has content that violates the Google guidelines (such as adult content or gambling). They will stop showing ads on that site but they don't ban you from being an AdSense publisher simply because you own a site that they deem unsuitable for their ads.