Although...different use-cases there, for me. I've got a dozen audio sources, either connected to speakers (the TVs) or within a couple feet of me when I'm using it (phone, media player, tablet, laptop). So, a bunch of sources, a couple of which I might be listening to at once. All either in short enough distance for cords, or loud enough that it's moot.
Wifi: The internet comes from one (inconvenient) place in the home that I can't choose. I've got a couple of powerline ethernet adapters, but I've also got a lot of devices that handle wifi, but not ethernet. The choice is between using wifi or skipping the network connection. It's great as a last- (or only)-resort connection option, and it's usually sufficient, but then my uses for it are usually pretty tame anyhow.
Bluetooth was originally encrypted, but gained the option of non-encrypted channels with version 1.1.
On top of that Bluetooth use frequency hopping.
Until recently there was no real hardware for scanning/sniffing Bluetooth traffic, at least not anything easily available compared to a wifi card in promiscuous mode.
As a matter of fact, my desktop & my laptop are both wired, and I hate how flaky WiFi is on my phone & tablet. Just moving to different rooms in my (small house) does horrible things to my network connexion speed — but Ethernet keeps on chugging along.
Wifi: The internet comes from one (inconvenient) place in the home that I can't choose. I've got a couple of powerline ethernet adapters, but I've also got a lot of devices that handle wifi, but not ethernet. The choice is between using wifi or skipping the network connection. It's great as a last- (or only)-resort connection option, and it's usually sufficient, but then my uses for it are usually pretty tame anyhow.