If you read the website a bit more carefully and stryder's post, you'll realize that they make very high quality keyboards. The keys have a special feel to them. It's true that it's not worth $70, but it's not comparable to a $10 keyboard. Not to mention, the winkey is, but 1 single key (or 2, it doesn't matter). There are more keys that are different or in different places. It's typical for keyboards to have the Enter/Return key L-Shaped, but on the happy hacking one, it's the Delete key and Enter and the Backspace key is the Tilde key, and the Tilde key is the ESC key.
I've remapped all my keys to approximate the layout except for Backspace and I find it really convenient.
But I really want to try one out, before getting one.