Once issued, I hope to never revoke a subdomain unless required by law, by the InterNIC , or for non-payment. However I reserve the right to do so. I will not issue one or two character subdomains, because I want to issue subdomains of such domains. So for example I will not issue E.Voss.org because I want to preserve the ability to issue Wm. You will still need to pay someone else to serve your domain.
Normal email is about as private as a postcard, and easier to fake.
Therefore I use PGP to authenticate my messages, and where possible to provide some privacy. Generate your own 1000 plus bit key, sign it yourself, and upload it to the Public Key Servers. Sign your message with your PGP key, and encrypt it with my public PGP key. Wait for me to reply. If I say no problem, send me a check, and find someone to serve your domain.