Keeping score by hand is such a thing of the past. I remember as kid, making money by keeping score at some of the local big tournaments. You sat there, wrote the scores with grease pencil on the overhead and at the end day walked away with $10-$20 in tips, plus a small amount from the center/tournament. Not bad for a youngling.
I still remember one house we had growing up. As the other houses were going to automatic scorers, this house refused to budge. It was older and didn't even have overhead projection. Every score was on big sheets of paper. I can't remember if they ever did get scorers or not. They were forced to close because they didn't own the land they were sitting on and the owner sold it to developers when real estate prices jumped. They decided a strip mall would make them more money then the bowling alley.