I believe that the purpose of each LP newsletter is to increase morale, membership, and donations. Therefore, I am stunned by the number of newsletters out there that whine about apathy, do dirty laundry in public, tear down other Libertarians, etc.
Impressions are everything, and it is a self-fulfilling prophecy.
If your newsletter focuses only on the good stuff, you'll find more good people becoming motivated to do more good stuff. If your newsletter whines and complains and tears down, you will encourage more of the same. It saved a lot of time, and I always knew what length text to ask my authors for. I also used a spreadsheet to lay-out current and future issues. This way, I was able to reserve space for multiple ads, regular features, etc.