I have read your posts, just went back and did it again. Are you reading mine?

If you are, why aren't you responding to the specific objection instead of accusing me of trolling and sighing over my lack of understanding?

I think I understand what you're saying is happening - and I'm finding it improbable.

Having a nipple snap and leaving the barrel on the spoke - fine, no trouble there.

Having a nipple snap and sliding up/down the spoke - as I interpret it - like a bead on a string, past the threaded part - seems improbable due to the ID/OD interference that the bits I build with would give me.

Yes, I know you keep going on about "damaged threads" - but that just leads to the balancing act of damaged enough to overcome the ID/OD dilemma, while being intact enough to carry enough strain to snap the barrel. Not impossible, but improbable IMO.
If you're insisting that it's what's happening - well, fine, just say so outright.

Or bring out the vernier caliper, say that those crappy wheels you mention have spokes that are just a tad thinner than the stock gauge would have it and that would explain it.
Or maybe those nipples have a bigger ID than what the standard prescribes, that would also explain it.