It's often told tale in NOLA. It's also why cab drivers won't give you a lift near a graveyard, especially St. Peter's Graveyard #2, the "resting place" of the city's voodoo queen.

Damn inconsiderate ghosts! But are they really?!

Let's follow this through...
What if the ghost didn't disappear before the end of his/her trip and did try to pay, would the money be ghost money and thus disappear when the cab driver tried to accept it? Would this be more or less annoying? If the ghost doesn't know they're dead and they are trying to be honest, and it's just not working out the way anyone planned, can you really hold a grudge?
Sure the cab driver will still be short that fare, but could you really be mad at the ghost?

I would feel sad for them rather than mad, and worried. Heck, there might be a business opportunity here for Ghost Therapy... not that they could pay you, but it might help them... move on and stop stiffing cab drivers.

I gave this way to much thought...

Who ya gonna call?