You don't buy a safe so that you'll never get robbed. Banks don't have that as a desirable security posture! [+] You buy a safe to cheaply decrease the total cost of theft.
[+] Fun fact: average bank robbery costs the bank only $8k or so in lost cash. This is one of the many reasons why every bank in the country has In The Event Of A Bank Robbery Don't Try To Be A Hero Seriously It's Pocket Lint in their training about it.
Also, as this argument depends in part on insurance, the insurance companies are entitled to the same information.
The real point here, however, is not that the safes can be broken, but that they can be broken relatively easily with techniques that have been known for a long time, and which can be defended against. There is no strong case to be made that this is a well-engineered product.