It's possible, but perhaps most of the people buying them are only using them for audio?

I've had a few sets of bluetooth headphones, and only used them for audio, so I can't compare your experience to mine. I returned or abandoned all three sets, though, and not because of quality, but because of range. I know bluetooth is designed for personal networking and everything, but I had problems when my headphones were on my head and my mp3 player was in my pants pocket. I tried changing the side I carried it on, and even carrying the player in my shirt pocket, but it would only play clearly when the player had direct line of sight.

Hopefully the Bluetooth 3 spec will do better on the audio side.