No more Jump scare maps....it is getting unoriginal.

[Prelauncher]

I don´t think that you can judge a custom story only by the number of jumpscares used in it. There is no maximum for the amount that you can use in one story, what limits you is that you can only have so many jumpscares based on your skill as a mapper and scripter. A custom story using many jumpscares can be great as long as the one who made it created an intresting story that the player care about, made the maps heavily atmospheric and that the jump scares are original and works with the story.
What people have to learn is that you must know how to use jumpscares and what to use. By using a jumpscare you throw the player into a sort of climax in the gameplay and you need to keep the player on edge and in stress for a while after it. And, most important, after using the scare you must be able to top it later in the game. Take a look on Yahtzees videos about God of War and you´ll see what I´m talking about.