Sorry, we just added the plugin to the directory less than a week ago and it didn’t ask for cost information. (Comparing this to the process of when we added it to the google gadgets directory and it asked us for all this information.)
We will add this information to our plugin page.
And to be clear, our pricing structure allows you to use tal.ki as much as you want, we only limit the display to recent posts on free accounts (members can always search for old posts or start new topics).