What if we have the ability to show only excerpts for not logged in users in a chosen topics. But this excerpt position and length are defined when needed by the author of the topic.
This could be defined into any topic content (without the need to do any general setup) by placing a special code (just like HTML code special to Discourse).
The code could be any thing like:
<x> shown text </x> hidden text.
or
<x-start> shown text <x-end> hidden text.
or
<excerpt> shown text </excerpt> hidden text.
Example:
<excerpt>
Here is a text seen by anyone " whom allowed in the related category security setup default" </excerpt>
and here is the rest of the topic’s text which shown only to the logged in users “which is also considering the related cat security”.
So Everyone see only excerpted area with ( … login to continue) added:
Here is a text seen by anyone " whom allowed in the related category security setup default"… (login to continue)
Logged-in users see all topic content:
Here is a text seen by anyone " whom allowed in the related category security setup default" and here is the rest of the topic’s text which shown only to the logged in users “which is also considering the related cat security”.
The main idea is to improve the rate of registered/logged in users and to be able to bring them back more frequently by the summary emails.
The usage of this feature could be selected only on some topics which the author/moderator believe that the user would need to see the rest, so he would register.