Having seen a number of professional authors recently not quite fall into this, but something similar, in which they get a few books into a series and either lose interest or don't know how to continue, I'm very interested in specialized incentives that could be offered to provide assurance to consumers and keep authors aligned.
For example, an opt-in program where authors allow Substack to keep keep a portion of the monthly revenue until some criteria are hit or some time period passes, whichever is first. For example, if each month 50% of the author's cut is paid out to the author, and the other 50% is kept and paid out in installments based on the number of content posts delivered compared to the author's target. For example, it an author plans to release 4 content posts a month, and their cut is $100 each month, they would be paid $50 for the month, and $50/8 per post after that for that month, so within two months they should get the full amount. After two months there would be an equilibrium and the full amount would be coming in ($50 for current month, $25 for each of the two prior months).
Now, I'm not seriously proposing that exact system, but an opt-in system such as that (with some variation on time frames, etc) which could be have a specific tag would go a long way towards making me feel like I'm investing in something that has a future when I pay, because let's be honest, some authors have been able to coast on a good reputation and some beloved prior works for a long time without needing to put out anything in the same vein. That's their prerogative, but at the same time I'm at the point in my life where time is at a premium, and money is less so than when I was younger, and if I'm going to invest the time and effort into a serialized work, I want to do as much as I can to make sure I'm doing so in something that will see an appropriate end.