Of course, it may be that there are substantially fewer players installed in cars, what with everyone buying 1, 2, 3 or more "spares".

Yes, but I want a spare tuner module, too.

BTW, do you have any idea of how many unique customers you have? I know, it is hard to tell how many of 'spares' will end up as real spares, and how many on eBay or as presents...