Update:
Called GCM and was told the reason they had zero balance was because ebay/paypal had contacted them and asked them to cancel the transaction.
So, apparently it's not enough that ebay ensnares HTTP proxy users in their Site Interference Policy screener and threatens their accounts -- they also try to cancel your current orders.
OK, that's fine -- from ebay's point of view.
So, I ask the GCM rep if they had cancelled my paypal charge as a result. To which they assert "that's something to resolve between you and ebay/paypal since they asked us to cancel it". Ha!
OK, call ebay and tell them what happened and I get a face of ebay I haven't seen before. They were so eager to open a case against a "seller". Since GCM has given me the cold shoulder, I had no qualms with ebay doing this. So ebay opened a Not As Described case for me and asked for "replacements".
Being a moderately-sized seller on ebay myself, I know GCM will hate this, but they may be big enough not to care about one case. But it will be fun sitting on the side and watching how this plays out.
I'm sure there are no fewer than three ebay departments that have no clue how to talk to each other involved now due to this fateful October 21st transaction. And now a huge seller, GCM, gets to deal with them.
On the state of my "appeal" regarding the alleged violation of the Site Interference Policy and my 14-day buyer suspension -- I was told by multiple CS reps yesterday that these actions are "non-appealable" even though an appeal had been filed and I had an appeal #. I asked what would happen on a third violation -- would my buyer account be permanently suspended without appeal and they said, "yes, but rest assured that we have made notes in your account." I asked, "what good do notes do me if you can't appeal." They didn't have anything to say. The appeal process is definitely a black hole and their CS reps have no power to do anything to an account.
I'm half-tempted to drive to San Jose and see if I can get into a shareholder's meeting to ask them a couple of questions about their customer treatment...