No, you were just happy to smack on DA's support policy without understanding either what it means or what problem the eBay dude had.
I would assume that some of the more apparently draconian measures in the quote support policy is because people do stupid things when moving cabinets. *I* still make stupid mistakes moving cabinets -- doesn't mean that the seller should pay for it. As for the manufacturer issue, I would guess that at least some of the stuff that DA installs confers rights upon the ultimate purchaser, not upon DA, so that DA may have no recourse in the event of failure, regardless of whether or not they want to help (see the previous statements about stupid things and cabinet moving).
Consider, for example, the software that is included -- who is responsible for supporting it ? I certainly don't call Best Buy when I want support for a game I bought there. Nor do I expect them to intervene on my behalf. I go to the manufacturer.
As I said, let's wait to hear DA's side before judging anything -- after all, it sounds like DA was working with this guy for MONTHS, which extends well past the 30 days stated in the official legalese.