Retail theft is becoming a huge problem, police generally won't respond to it so many of those who do it know they can act with impunity and retailers are left with few options to deter theft.
It's sort like how everything being priced at 6.99 is actually to prevent employee theft (customer expects change from their $5 + $2). It's not a psychological trick to make things seem cheaper which is to actually just display 7, a single digit number.
