[rotation1]

Bit off topic but you might want to 301 redirect to the right page instead of just disallowing search engines on your subdomains. This way if someone links to the wrong page you will still get the link juice.

I might have misunderstood that first bit though, since it looks like you do redirect anyway.

[transmit101]

I can imagine a scenario where we wanted a sub-domain which didn't redirect, but also wasn't crawlable. But I agree the example is a little bit contrived ;)