I would think if you used & took care of them a few velocities, even clones ought to last quite some time. Not sure kanathal will be on any list or not as it can be used for other tasks. What is it if some hobbyist buys a mix of fifty foot spools every few years? Nothing of great note.
See a point though for those doing mouth to lung. Kind of difficult keeping nice tanks. Again, some care & visiting hardware shops for o-rings, maybe? What are good rtas for mouth to lung? Oh, no, I need to see more porn. No, I don't. Excuse me a minute.
* walks to a room adjacent, closes door but his growling and roaring are still heard, cursing in about eight languages, actual cursing and not swearing ... walks back in *
And they can count it for the horse they rode in on, as well. * sighs, smiles and looks off somewhere not here *
I think misanthropy looks better more and more.