Maybe, but it seems like certain variants pull a lot more on ebay than you would expect for a "dead" technology. I recently picked up one of the early USB 250s (the one with a separate power adapter) in order to use it with the FW adapter. I don't know how many auctions I watched and bidded on before I got one at <$15. Most were starting for more than that... and selling.
There seems to be an odd but active community of Zip users. I know some is from vintage synths, but still...