Russell Coker via luv-talk <luv-talk(a)luv.asn.au>
They usually only allow one DNS name so they can
make you pay more for a
second or for a wildcard certificate.
That's why letsencrypt.org
and similar initiatives are long over due and also
I would only pay for a certificate that had a real identity verification
service behind it (requiring, e.g., presentation of government-approved ID).