Here are the questions I would want answered:
- Catalog: What am I subscribed to?
- Effort: How much time do I have to put in to tell it what it needs?
- Money: How much are all these costing?
- Utility: Is it worth it? (my usage of a subscriotion vs the cost)
- Optimize: are there better deals based on my usage?
- Compare: Is there anything better? Or similar?
- Notification: Tell me when there's something I should know.
- Discovery: What is out there I might like, but I don't know about?
Any service that helps answer those, and can prove that its price is saving me enough to cover the cost will be worth it.