As I stated earlier, it is your Pref.
But as your Brother stated, I too have met many members of other GLOs by wearing letters. I really like meeting members fro other GLOs and sometimes I find mine. Hell, a Kenny Chesney concert, I met 5 LX's, a BTPi, and a ZTA even though I was looking for an AGD!
I do not wear them all of the time, but if I wear a ball cap, I wear mine with letters.
Why should I advertise for Old Navy, Da GAP, Buttweiser, Nike just to be cool and over pay on items?