My favourite revenue enhancement technique was back in the late 60's early 70's where a particular popular model of American descent, required an engine hoist and disconnecting the motor mounts to raise the engine in order to change the back two spark plugs - a V8 engine no less.

Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good ...