Speaking with the guys at Zu, none of the B-stock cables are returns or anything, but if an RCA barel has a scratch or a small snag in tech flex or minutely shorter lead, etc. it will be considered B-stock. I have one pair of their ICs and, aside from the conspicuous "B" designation, it looks perfect to me.
As for the Events, the whole line isn't even out yet--just the PCs and LCs. I have no idea what they'll do to promote them when they rest of the cabling comes out next year, but it was mentioned to me that 2011 would be a dry year as far as promos.
My suspicion is that the marketing strategy is one geared towards mass exposure at loss leader pricing. Its probably not profitable now, but they're creating a lot of excitement and internet buzz (deservedly so) around their products and professional reviewers haven't even chimed in yet.
I'm interested to see how well the company does next year and how the market adjusts to them actually observing retail pricing. I for one am rooting for them.