Bluetooth theory.....

Today I had my first major encounter with the bluetooth technology.

One of my friends has a Sony Cybershot digital camera. So I borrowed it last night, took a couple of photos, and shot a video. Naturally, I'd like this stuff on my pc. So i bring it home. I had forgotten to get the only-works-on-sony cable from my friend, since the Cybershot doesnt have a normal usb port. So i had to think of other alternatives. I took out the memory stick duo, and stuck it in my sister's Sony Ericsson v800. I then borrowed my brother's Bluetooth adabter, stuck it in my usb, and waited. After a while the 2 devices succesfully paired. So I browse the phone, find the memory stick directory, and voila, the pictures and videos are all there. I felt really smart at the moment. Drag and drop the files into a folder on my pc, thats all i had left to do. Or so i thought...
Its speed is supposed to be 720kbps. Thats like 90kB/s. Just like a good cable line. Right?
Then why am i still transfering a 40 mb file from my sisters phone to my pc? Why am I getting speeds like 14 kB/s ? I guess bluetooth just isn't such a great technology afterall.