Earlier quoted context omitted.
I bought the AVP for one thing only - long haul flights. It makes the experience completely and utterly different, and it's less than the cost of a business seat. It "works for me".
what kind of flights are you buying that cost 3500 for a business seat? do you get them very last minute?
Regardless, you don't throw away your headset after a flight, obviously, so even if the ticket were half the price you'd still come out ahead after two or three trips.
This said, headsets like AVP improve the flying experience but don't magically solve it: they are still too heavy and uncomfortable to wear for more than 1-2 hours. That's why I'm betting on the more lightweight (and cheaper) sunglass-like products to actually win that market.