Kudos to you. (Though I'd like to ask, do you respect it in the common sense way by not storing any information about a DNT user or in the DAA sense - i.e. "we understand 'do not track' as 'do track but only show untargeted advertising'"?)

However, I'm more concerned about the hundreds of other services that might not. My point was that DNT requires cooperation from a huge number of actors to be effective, with the actors having no incentive to play along and nothing to fear if they don't.