I completely agree with the OP, but because of the cost in actual money. For $10, it should be account bound, not character bound.
I was about to purchase the item, but right before I did so I noticed that it soulbinds on use. That changed it from a pricey convenience item to completely worthless to me. I swap around between several characters (I can not log in for a day’s worth of playtime and not have actually played at least 3 characters by the time I log off), but to be able to outfit them all with this convenience would instead of $10 (and even more frequent bank-trips than I already make) become $50+. I’m not dumping $50 into this sort of thing – $10 was pushing it in the first place.