I understand your question, and it is hard to describe. Our brains are pattern generators, and it "feels good" to resonate with patterns we've already experienced. Neural circuits create patterns by strengthening connections upon our experience. This is particularly true as we get older and our brains become less plastic. Lesser used patterns become harder to access as they are no longer reinforced as frequently. However, this feels less good for our brains, and we value novelty.

So in the same way that riding a bike after a long time is much harder than it is to ride one when you use it every day, you can generalize this to something like emotions. It is bad to only experience one type of feeling all the time, and variety is good. Having a controlled, relatable medium lead you to experience a less commonly-felt emotion feels good. I don't know if I can explain why--maybe we have mechanisms in our brain for encouraging this novelty--but this is likely why we seek out these emotional experiences.