[...]These keys are a dime a dozen, and aren't suitable for anything.[...]
With this keys you can activate your Windows over the internet and you will have a fully legal windows. Why there aren't suitable for anything then? They work like physically keys.
for home users, this isn't anything different from a crack (easily obtainable).
For business users, who can't used cracked because they'll get sued, msdn keys are not suitable because you need to present PHYSICAL keys in an audit. and msdn keys are not for use in production environments.
The only thing left is the "moralists" who want to help out m$. msdn keys don't help M$ at all, because you got them for free.