You can save a ton of money shopping at thrift stores, but those low prices mean you can also end up with a bunch of junk you don't need. This simple rule of thumb will keep your thrift store clutter under control.
For many of us, shopping entails hanging our heads low and keeping to ourselves as we grab what we need and leave. But shopping op shops is a different beast. You're actually better off wandering around and paying mind to other shoppers.