The rewards from doing the parkour are so dogshit and repetitive that its more worth it to just stand around with your thumb up your ass and play other games while you get passive income then come back and gamba what you got. The parkour courses are insanely short and repetitive and there's only one of each. They're boring as all hell. They don't even want you to do that part of the game either, as ALL THE BONUSES only affect passive idle income.
There's no way to do 100% rolls and the second something becomes a 100% chance with the current goods, it becomes ineligitble to be rolled on, so you always have to have a small chance at failure, for any item you roll on by sacrificing skins.
The only slight enjoyability comes from the dopamine of gamba of trying to get an item with an insanely low chance and getting it.
Do yourself a favor and don't even start.