You need to be, or at least look like, like a real user before you even attempt to post your offers. Usually accounts like these are well established in the community with a lifelong of karma.
According to my experience, the biggest difference is that some accounts behave like normal users first and promoters second. They spend time commenting, participating in communities, and building a posting history before mentioning anything. Accounts that only show up to promote, post links frequently, or repeat similar patterns seem much more likely to get filtered or suppressed over time.
