These things ebb and flow, on eBay.
There is a search that I've run daily for a few years now for an unrelated and even more rare car. It is interesting how the quantity of offerings swings wildly.
My opinion? Karma isn't a winter car which makes it a slower seller right now. And car sales are notoriously slow this time of year.
Also, alot of people who have owned these are doing well now between the markets and the economy. And there's a manufacturer back in business again with at least some factory warranty. So those people are getting out. But you may not be seeing them as the sellers. This car has become a star at the wholesale auctions, so the aforementioned sellers are trading them which is why most sellers on ebay are dealers, not individuals.