I have a kingsley machine. I've only hot stamped a few hundred chips though.
When I bought it, I said I would only be doing it for my own personal use. I have no interest in stamping for others.
This isn't out of greed or anything, it's just a few things:
a) It takes time to hot stamp. Time is unfortunately, at a premium quite often for me.
b) It takes practice. And I don't want to practice on other people's chips.
c) I am prepared for failures (for my own chips.) I will make sure that I have enough extras in case that I screw something up. I can't expect others to send me a surplus in case of errors.
That said, it was quite therapeutic stamping the chips. Scraping them afterwards was much less therapeutic, and more of a pain in the ass.
Mike