Congratulations to the Logos team. Logos 9 seems to be the smoothest roll out of a Logos update since I started years ago. I always dreaded the new versions because of all the confusion surrounding the options. Compared to some prior years, this upgrade seemed pretty simple and understandable.
An every two year upgrade seems a reasonable price to support complex software that runs on Macs, Windows, Android, iOS, browsers. Not all Bible software companies survive (look at all the Bible software companies that have folded over the years and recently).
Although I am no longer looking for books, as long as I able to afford it, I will continue to purchase the functional upgrades so that I can continue to have the software available.