I wouldn't want to do it because I don't want someone flagging me down after an accident and carrying the liability that comes with that.The tag should just read "MUGME" instead. I wouldn't feel comfortable letting strangers know what my profession is given gross public misconceptions about physician wealth (and crazy stuff like this happening: https://www.policeone.com/patrol-issues/articles/3873318-Pharmacies-see-an-armed-robbery-epidemic/).
Butttt, the point of the plate is to allow medical staff to park in no parking zones around a hospital. As someone who works in a Manhattan hospital, that is pretty useful. It sometimes takes a grad student in my lab over a hour to find a parking spot