you keep losing 10 bucks and you find yourself pulling wire out of a printer instead of buying a spool of new teflon from digikey.
There is always a need for high quality consumables to improve project quality and small sums add up quick in this hobby IMO.
There is a ton of 15$ nicknacks that are hard to buy, and you never get that good work flow going if you keep wasting money on avant garde experimental thermal stuff.
A mechanical gadget, IMO, usually will be worth something, because it can probobly do something so long its made of metal. A thermal gadget??? that can easily be a total waste of money.