Card shops keep getting broken into

A Houston shop got hit with a sledgehammer: about $10,000 in damage and $10,000 to $15,000 in cards gone.
Same week, two guys bricked the door of a Cypress, TX shop that's only been open five months.
In Branson, MO, one guy spent about half an hour in a shop and left with about $10,000 in stuff plus $1,000 cash.
Shop owners there are in a group chat watching for the stolen cards.

What stops a break-in better: alarms and cameras, or pulling the good stuff out of the cases every night?

Source: ICv2