Thanks, but I'm very aware of that support page. It would be really useful it they would add a read-only role to the permission options, because there are some users that you may not want to be able to contribute. And for those, you don't want to have to be deleting their contributions continuously -- that wastes their time and yours and can create consternation if they have the expectation that they were invited to contribute when you really intended that they should just be readers and not contributors. It seems like that should be an obvious option to make available to blog owners.
If you go ahead and get your own website, can WordPress be configured to have a read-only role for users?