They might sell them for that but when you're selling to a "low end" market at £4/year $10/address is quite expensive. Especially when we don't need a range bigger than a /27.

I agree there are still IPv4 addresses about but this teaches people that they are running out and we should look for other solutions.

At $10/IP, I'd say "shortage" is pretty well defensible.

We'll never run out of IPv4 addresses. We'll just reach a point where each one has a mortgage-sized pricetag. (Well, we would if we were stuck with IPv4, anyway.)