It would be much better if they would just post the prices of ALL available plugins, as well as descriptions and usage instructions for each. Otherwise, it seems they're hiding something, which is not a good image to have.
@powerkeys: I don't think they are hiding something. Most of their time is spend on support and new development, my guess is that updating the website comes after that. Customer definitely comes first if you ask me, support is really fast and good. @jackgordon: a plugin for protection on another domain.