I say...To each...His own.
My middle Son got me one two days after I brought my Roadie home...and he don't even ride!!!
Mine has the USMC Eagle,Globe and Anchor Symbol on it. My boy said it was to "keep you and Mom save while you were riding and to remind you of your time in the Corps since you've been in the Army for 14 years now."
I thought that was pretty cool.