It's very strange— like resting your hand on a basketball on the floor before dribbling it. It doesn't compute. It's not an organic component of playing the instrument, or of being at rest at the instrument— it puts an unnatural pressure on your hand, and you have to grip the stick harder to hold it there. Can you imagine a violinist dragging the bow across the strings when getting set to perform— screet. What? Does a pianist push the keys down before playing?
Where I come from, the sticks never touch the instrument unless you're playing it. Standards are looser on drumset, but generally, anything you do with the sticks that is not actually playing the instrument should be done silently, or at least discreetly. In all of concert percussion, and in drum corps, silence and no contact is an absolute rule. Yet I still see those guys doing it in their videos.
Look here: a student of Buster Bailey, king of the world in concert percussion, doing it (in an otherwise very good video):
Here's an old school rudimental guy doing it. And technique god Bruce Becker— granted, he appears to be doing it silently. In a video I can't re-locate, Gordy Knutsen does it— also with delicacy, like Becker.
Often you see people doing it on a practice pad— it's silent, so maybe they're just not aware of what they're doing. But here's a pipe band drummer doing it on a drum.
Here is how it is done: not only does Shaun Tilburg never touch the sticks to the head when he's not actually playing, when he sets the sticks on the drum, he takes care to do it very discreetly. With his demonstrations here he makes some preparatory motions very close to the head, but never touches the head:
If you're Bruce Becker you can do whatever you want— well, everyone can do what they want— but if you're any normal person, try to break this habit. It suggests a lack of performance discipline, and may well bite you on the butt if you do it unthinkingly in a sensitive situation.