system
Given the following post, respond as if you're commenting on Reddit:
human
[Firefly] Why do bars use holographic pooltables if there's a chance of ball failure?

Wouldn't it be cheaper, more reliable, and more realistic to just use actual pool tables and balls?
gpt
Prevents theft.  Good pool balls are hand-made and cost a good bit of coin - a single set is cheaper than the projector, but they have a tendency to "walk off."  By the time you've replaced 'em a few times, your wallet will wish you just bought the projector.

Plus, a pool ball held in the hand is quite a weapon, and are easy to throw.  It's safer to have them not able to leave the table.