Throughout the ages, the boatsman kept his fare the same: one soul, one coin.
It didn't matter what kind of coin it was or how valuable it had been in the land of the living.
He liked to collect coins.
On the weekends, he showed off his vast coin collection to his friends.
The job called for a stoic, professional demeanor, so when he was given a coin he didn't already have, he'd fight hard to keep his composure.
Nobody wants their trip across the River Styx to be performed by a giddy skeletal ferryman.
It's not like you ask for "do overs."