Every post that improves the discussion on the topic gives a new solution, or a new constructive opinion deserves karma +
At the same time, nonsense spam posts that are only there to fulfil the post quota for the campaign deserve karma -.
Personally, I have no problem rewarding such posts. It's a shame that we can't even have an insight into which post got karma (regardless of + or -) that would probably help many to recognize where they went wrong and what needs to be improved.
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I don't know what's the main purpose of karma here since they already removed the conversion of karma into ALTT tokens already. 
Good news for us @LogitechMouse, I remembered reading about this thread this past few weeks that this rule or the conversion of + karma to ALTT token is valid again. The admin updated the rule and you can request to convert it if you want.
This is wrong because karma is the only parameter whether a user contributes to quality, without having to read all his posts. It is very useful for campaign managers and facilitates the candidate selection process.
If it is already possible to convert karma points into ALTT tokens, maybe the admin could add certain badges like 100+ earned karma, 500+ etc... So even if he were to convert karma points into ALTT tokens, his previous contribution to the quality of the forum could still be recognized.
In the end, those who cheated are punished by deducting karma points, so in the end it equalizes the punishment of those who showed real quality.
edit
Right after I wrote this post, I opened a topic where the admin gives an explanation supplemented with screenshots, everything is more than clear.
https://www.altcoinstalks.com/index.php?topic=313190However, someone thought they had something to add, in addition to the fact that it does not refer to the problem that caused the topic to be opened, it is also very confusingly written, and it does not explain anything.
To go back to the same topic after posting you can click on your profile option from there you can go to show post option and click on the last posted post link but you can reach the previous topic. If you find this too cumbersome then the last post you post will be at the top of the specified section and your post will be at the very end. Your task is to find your post by going to the last page of the first topic in the specified section.
So what do you say, does this post deserve + or - karma?