Consumer Quantum RNG

What applications need hardware random numbers at the high data rate those provide? For almost all applications a good CSPRNG like Fortuna periodically seeded with hardware entropy is good enough--even for key generation and one-time pads.

Given the massive cost difference between those and something like the one at http://www.entropykey.co.uk/ ($1300 vs $60), I'm having trouble thinking of when I'd pick the former.

In the discusson of this that just occurred on Reddit, someone did mention a use for the fast but expensive kind. He said they are distributing random numbers to many others for us in seeding. Kind of an internal random.org. Even there I'd expect Fortuna on the distribution machine periodically seeded from a cheaper generator would be sufficient.

These aren't too unique - there are several out there:

http://www.google.com/search?q=usb+random+number+generator

Also, many chipsets have built RNG's that work of thermal or electrical noise in the system, such as many of Intel's i8xx series.

You can also buy hardware that provides RNG's and crypto acceleration - here's a good list from OpenBSD:

http://www.openbsd.org/crypto.html#hardware