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The only thing you can be 100% certain that ebay cares about is profit. That's what management compensation is tied to, so that is what makes them do one thing or another. Any single case or person...

It's not justification it's just an observation.

Why would ebay go to the expense of training staff or increasing package costs, when the buyers and sellers are willing to simply assume the cost...

It all seems fine to me then. The damage due to poor repackaging is apparently well compensated by the increased size of the market.
The sellers and the buyers are happy with renegotiating a lower...

Are you sure that they are not going to assume liability for the damage they have done and pass it to the seller? That'd be a big class action lawsuit in the waiting.

Isn't there some sort of insurance to make a claim?
Financial pressure is the standard way to push for improvements.