Heya Professor 
I also offer them unique, @ $25 each…. I generally suggest to subscribers that they change them up a bit to keep them unique I noticed that you subscribed by the way.. Most exciting moment of my morning 
BuT…. IN answer to your question… I do mix them up a bit, that’s why I only offer 4 Just haven’t finished explaining that on the website, offering 4 per month in the subscription plan allows me to write as many as 16 of them to distribute to subscribers, and gives me room to breath whens someone doesn’t offer new slots that month
~LadyH