I promise not to sign up myself but I was talking to a friend ...
Some retirees, especially retired pastors of small churches in small denominations, have very meager income to pay for subscriptions and it would leave them nothing for books. My first choice would be to have a very low subscription rate preferably including the sermon editor, for retired users over the age of 70 who have used Logos for more than 7 years [any numbers that you want would work]. One organization to which I belong handles it with a pay what you can subscription. My second choice would be to create a fund which Logos users could donate to which would subsidize the subscription for this group of people.