>>14455441Unless you've got a badass attacker who becomes unstoppably fast with a choice scarf, but the extra 100BST is dumped into its still-piddling defense stats, meaning it goes from outspeeding threats and OHKOing them to going last and STILL not being able to take a hit worth shit and getting KO'd quickly.
An extra 100BST on Shuckle added to speed and SpAtk wouldn't be worth half as much as leftovers and you know it.
Or, if you mean specifically Life Orb, maybe the "marginal power difference" is the difference between a guaranteed OHKO on all major switch-ins and a guaranteed 2HKO.