Trackable tattoo

What are people's thoughts on having a tattoo that you can make trackable? I have thought about making a tattoo of mine a trackable that I can show off at events so people can log/say that they have met me in person, either out caching or at an event, and it would allow me to put names to faces when I go out as well.

Has anyone else done this? I know that the official rules allow you to have a trackable tattoo which is where I got the idea from but thought to pose the question if it has been done. If people have, do you regret it? Has it been a Pro?

EDIT: I went ahead and added the TB code last week. Went to an event last night and had 2 people log it.