I do agree that's part of it, but I think there are other reasons as well. The change so that you can no longer see who's bidding is one, but also the attention drawn to the auction from here - this forum is visible to non-members as well, and a small number of people enjoy driving up prices (I presume for 'fun') with no intention of paying.
And as you say, with ebay's lack of punishment for non paying bidders it makes it pretty easy for people to mess sellers about and know that there is going to be no problem if they back out of the transaction.
If the seller was so annoyed...he could just have offered it up on a second chance offer after all. With a lot that size, that's what I would do. So while I can feel sympathy there was always an alternative to re-listing it if he preferred.
As LadyG says, I always think its worth remembering that when a lot like this gets this level of attention here, its inevitable most bidders will perhaps have read this thread. Maybe realising that the lot was not so much of a bargain but more on par with value made the winner a little reluctant.