If you study how their offers differ from yours, you will have an understanding of what to do differently.
Take a close look at those that do promote similar services on AdWords, do any suggest that they provide webspam or anything Google would view as webspam, or build links on content that ads no value? Do any suggest that they build links to manipulate PageRank?
The answer is no, those that are allowed to advertise on AdWords are companies that offer valuable content with the links they build. They claim to promote traffic to their customer’s websites, not to manipulate PageRank.