Worst case scenario is if the trail develops a bad reputation for over rewarding the same authors repeatedly, or other shady tactics. Flaggers will notice this and combat the rewards on all their activities so that the curators in those trails receive far less. They might even flag any posts made by the curators of a trail they despise.

Everyone is free to exploit their Hive however they want with the services available. Try out different things. Learn what works well for you. There are many ways to join and connect with others in inventive ways that can also lead to many shared, cumulative rewards.