Hi I understand u don't want to pay the extra few bucks for tracking but for YOUR Benefit you should cause if someone says they DIDN'T get it...you CAN'T Prove you sent it. That means you Don't Get the credits and IF you really sent it NOW you lost the credits AND your item. THINK about putting tracking, for your benefit!
I agree tracking is definitely worth the extra buck or 2. plus there are a bunch of scammers who try you even when you do add tracking, so it is the best way to protect yourself as a seller.