If all games bowled were recorded sandbagging could be kept under control. Bowling alley should be rated just like golf courses. Scores should be entered into a database after every league and or tournament. My feeling is USBC doesn't want to do anything about this issue because it would cost money they don't want to give up.
Difference is a golf course has little it can do to change the slope rating. Sure, cut the grass different, placement of holes/tees, but the course is the course.
At a bowling center, the shot can be easy or hard day in day out. I like the concept, but not sure it will be easy to implement.
If people bowl at dungeons for the sole purpose of having a low book average, then that is suspect. I have even seen people bowl lower than possible in the dungeon and justify their scores because it is a dungeon making the situation worse.
I used to get bent out of shape with sandbagging. I have since refrained and no longer participate in handicap events.