I do not post regularly. For this reason, there is no guarantee that there is more value in an annual subscription than a monthly one, so I have lowered the price of an annual subscription to $30, which is the lowest Substack allows. Both allow one to read everything on my page at the time it is bought. I do not expect anyone to renew a monthly subscription.
I will soon publish more posts about my science-fiction ideas which get into more specific things than what I have already written. I especially do not want to share those for free. I will gradually increase the price of the monthly subscription as I publish these up to the cost of the annual subscription. It should be thought of as buying a book.