1. If I buy a subscription and end up not using it, I've wasted money. 2. If I buy a subscription and end up using it, that means I should have just bought the lifetime purchase. So now I've wasted money. 3. If I buy a lifetime purchase and end up not using it, I've wasted money. 4. I don't want to waste money. I'll find a free alternative or build my own. 5. Exit app store, no sub or purchase made.
Talk about loss aversion...