One thing I've been noticing a lot of, in both Beyond the Rim and Long Arm of the Hutt, are skill checks where the outcome is predetermined to be a success, but the success or failure of the check determines how well it works.
In making Astrogation checks, a success means the trip is quiet and uneventful, where a failure means the party is attacked by bounty hunters on the way or has technical troubles they need to deal with.
It's not always that you succeed or fail at what you're rolling a skill check for, it can be more about HOW the outcome is produced based on the results of the check.