What happens to all the brass that had multiple firings?
Hopefully it ends up in a scrap bucket and is turned in for scrap. Brass is currently $1.60 a pound scrap. An Ice Cream pail is worth about $20!
A five gal bucket is over 100.
Brass cartridges wear out after X number of fireings, the variables being how hot the charge is/was and how it was sized. Primer pockets expand and the flash hole opens up. Necks get hard and split.
Someone can/could try to anneal the cases and screw it up getting the body and case head too hot, making the brass too soft and dangerous to load/shoot.
Full length sizing streches the body of the case leading to case head seperation And that can be a bad thing as you don't always see it. You gotta measure the inside case or at least check it with a wire/paper clip. Here's case head seperation of some 30-06 I came across, the one that's cut had
NO Visable Crack or External sighns at all !
Buyer Beware ! There are unscrupulous sellers out there. And guys that just plain don't know.