Basically, they do it to avoid getting sued, or even getting threatened with being sued. There is a law called the DMCA (digital millennium copyright act) that means that eBay must either take these auctions down when it asked to or take full responsibility for them from that point on. eBay doesn’t want to take any responsibility for your auctions.
It’s not worth worrying too much about it – 99% of the VeRO program is aimed at stopping fake brand-name goods or pirated media being sold through eBay. Big companies also seem to get quite upset when eBay sellers take the company’s ad copy, logos or professional pictures and use them for selling on eBay.
If you’d like to take a slightly patronising quiz about copyright to help you understand eBay’s policy, go here: http://pages.ebay.com/help/tutorial/verotutorial/intro2.html.