The academic publishing industry generates about €28 billion annually in global revenues, exceeding that of the recorded music industry. Profit margins for academic publishers like Elsevier, Springer, Wiley, and Taylor & Francis are much larger than companies like Apple, Google, and BMW. Open access publishing aims to make taxpayer-funded research publicly available, but different models like gold, green, and diamond open access have different costs and restrictions. The Open Journal of Astrophysics (OJAp) is an example of a diamond open access overlay journal that publishes on the arXiv for free with low annual costs. It has published over 100 papers with an average of 16 citations per paper and a 50% acceptance rate. OJAp plans to apply for inclusion