Heart, dedication, the rewards at hand for the effort put in, etc. Then the next thing you realize is "Boring? What's that word? is it even part of the English Language?"
Not that I don't think FSC is fun. I mean yeah, it's fun and all.
But once you've run it 30 times it starts getting tiresome.
Once you've run it 70 times it starts getting too repetitive.
Once you've run it 150 times, it starts becoming more of a chore instead of a loot fest.
It only gets worse and worse from there...
As a side note, with the Orbs and Sparks update, I see no more reason to run FSC unless you want the Brinks rewards. Really, I only ran it in the past because energy costs money. Well, now you can upgrade for free, and it just so happens that the Arcade has an Arsenal every Depth just in case you want to, you know, level up your items before you continue. Sparks and Orbs seem to come significantly faster in the arcade, which is all you really need to care about now that money isn't such a huge factor in upgrading.
@Mawashimono: Nope. My pet is a FREAKIN BEAST. All he does is sit on the sofa and eat potato chips and constantly demanding MOAR. Mawashimono, they are the worst friends anybody could have. Their cute impressions fools us all. 我把他们打死！