Listen to this former Mary Kay sales director (one rank away from the highest: national sales director, top 2% of all participants) when she walked away... Because she realized her success came at expense of other participants.
You can read the rest at pinktruth.com, or watch the full 20/20 episode here. Skip to half way point to get to the story directly.
The sad truth is some people NEVER wake up from this self-denial, because they crave outside approval so much, they were willing to forgo their ethics for outside approval.
Let this be a warning to all... "success" may come from stepping on other people's backs, even if they were smiling when you do it.