Ask HN: Implications of honoring do not track (DNT)?

For anyone who's chosen to honor the do not track flag what are some of the implications of doing so? I'm thinking of using it to disable Google Analytics / Facebook tracking. The only issue that's come to mind so far is not having the full picture when it comes time to sell the business. The last time I looked roughly 18% of the audience had DNT set. Thoughts? Also what besides removing analytics scripts are you disabling?