By gosh your investment in theft prevention better be outweighed substantially by the potential cost of theft.
If it isn't you may as well let theft go totally unchecked.
We don't think like this in business though. The principle of stopping theft becomes more important than the cost to stop it.
Principles in business are tricky things especially when they increase costs without benefit and or negatively impact the majority of your customers.
Are principles, tradition or inward thinking distracting your business? If so look out, seek your customers perspective and rational your spend by the benefit derived.