Manual or electric, machines that are so-called non-functioning are still of high value to collectors as the parts within those machines are no longer available, and ultimately they will be required to keep the constantly diminishing ranks of functioning machines working. After all, typewriters are a finite commodity.
And what is a non-functioning machine exactly? I've bought quite a few typers that were described as broken, non-working, seized, or in as-is condition, and more often than not, they only required a minor repair or a little basic maintenance to restore them to full functionality. How many typewriters that are destroyed using the justification that they weren't working could have been easily repaired and put back into circulation?
Keychoppers (http://thehackjob.blogspot.ca/2013/05/dont-feed-keychopper.html) are beyond contempt. They covet older, more desirable machines, drive their prices up, and in the end completely destroy them just to fabricate a few trinkets. Worst of all, they can't be bothered to make the usable parts of the machines they've ruined available to those who need them.
Given the number of full key sets I've seen available for sale of late, it looks like the supply of chopped keys has outstripped the demand for key-based junk jewellery. The only hope for collectors, or anyone interested in preserving history, is that this is an early sign that the trend is finally waning.