(PS. Forget charm; I have players who do this to me as the result of mundane Charisma checks! They'll roll a great Persuasion result, and then get miffed when a total stranger won't risk their life or livelihood to help them. Like, c'mon, the Arch-Wizard told this guy to guard the door; do you think he's going to move out of the way because some scruffy adventurers asked nicely?!?!?)
When players believe
Money = Persuasion check = mind control of NPC
''So, we're all agreed - everyone is aok with accepting the top secret mission for the Sultana, to fly across the hostile, monster infested desert on magic carpets and investigate the missing archeologist lost within the ancient ruins discovered on the face of angry active volcano?''
YES
''Ok, so as you agreed, you meet the captain of the guard under the cover of dark..''
WAIT. CAN I BRING A PROSPECTOR?
''..ness. Hmm what? As in.. a mining prospector?''
YES. AN NPC TO SURVEY THE AREA AND FIND POSSIBLE LOCATIONS FOR A MINE
''..er. To remind you, this is a Top Secret mission.''
SURE OK. HE'S JUST GOING TO LOOK AT ROCKS AND STUFF
''...in a dangerous ancient ruins on the face of an active volcano.''
I HAVE LOTS OF GOLD. I CAN PAY. WE CAN LET HIM OFF ON THE WAY. HE CAN DO HIS THING.
''........''
WE CAN PICK HIM UP ON THE WAY BACK