The cables (even the AVT cables) Only have about 7 bucks worth of parts in them anymore. I've been doing RF PCB stuff, and after moving over to surface-mount components I spend 100X less on components than I did in the old through-hole days. Combine that with Chinese PCB fabs and pick-and-place machines, and for 10 bucks each you can build them 10K units at a time...

The only thing you're paying for is the guy who wrote the software's time. Seeing as the software was probably ripped from someone else's project, most of those sales are just pure profit.