The NSA can't subvert a keyserver. At least, at worst they can replace the keys with their own, but then the Web Of Trust would render those keys untrusted. Getting the key from a keyserver or copying it from a webpage is equivalent. The benefit of the keyserver is if you get an email from someone signed by key X, your client can fetch the key from the keyserver then calculate if you have any trust of that key.
Also, I see that your key is on a keyserver: http://pgpkeys.mit.edu/pks/loo... as any key can be published to a keyserver regardless if you have the corresponding private key.