Except you need an account to create one through SteemWorld, and you can only pay with STEEM (from an account you must already own).
You also have to deal with recovery yourself; so even if you create one for a new user, you're stuck dealing with their recovery if they get hacked, or somehow screw up when changing their password. Also you start with 0 (ZERO) SP, so good luck being able to post, comment, or do anything until you delegate to it as well.
AnonSteem charges extra because there's a 3 SP delegation included (so an account costs around 6 STEEM), and I have to handle the recovery of stolen accounts, people screwing up when they change their password, as well as generally maintaining the website, handling support emails such as payment issues etc.