LastError It is a terrible price point that is a double loser. It reduces money from the whales and it vastly reduces the audience as well.
Price points for ebook subscription services have an established ceiling of $9.99 for a vastly superior service. An extremely high, but supportable, price point for a niche service like this is $4.99; given the quality and quantity of books (both of which are low), $25/yr is more reasonable. If they are making tons of money off of whales, then moving to a subscription service is a terrible idea.