I bought a pair a couple years ago when I first started sewing/quilting, and have yet to have a use for them. A good lesson on stocking up on tools before I have a need for them.
One thing I am trying to work on in general is not finding something I want to make, then running out and buying the supplies list. I have dozens of these projects (home repair, crafts, etc.) where I have done so and never done the thing. ADD maybe? Now I try to buy only what I absolutely need to start, then get what I must when I reach another step. Also check in along the way and ask myself if I can make do with something I already have.
The other way leads to a spending-guilt cycle, which is why I have pinking shears that have never been used and enough doorknobs to replace all the internal knobs in my house sitting in the garage for a couple years now. I need a supervisor.