Somewhat agree, but securing it makes it less likely to be lost as with a bracelet or necklace. Also, less likely to accidentally salt a sorcerer. Also, obfuscation of it allows you to mingle with sorcerers easier ( unless they can sense it, then storing it away does only small good - they find it respectful of you not to bear it and rest easier in your presence knowing a mishap is less likely ). Also less likely to be robbed from you, kinda like dangling around a diamond necklace marching with the GO ... brings attention.
I get your point of securing as to not salt a sorcerer buddy, lol. But, regardless of where its at on the person, a sorcerer feels/senses that pinprick of oblivion. I like how Esme wore it strapped and her belly. It was hidden under clothes making contact next to impossible, yet offered her constant protection. You think that would be a common way of wearing one. He'll, a man could do the same around the thigh or upper arm. Unless, you know, you are The Most Violent of all Men and go shirtless to show of all those swazond.