While the answer to this question is very straightforward, many people will want to know why they are cheaper than others. The answer is no; they are not made from weaker or even cheaper materials. The reason being is that all safes should adhere to a basic standard and most safes try to sanctify by the California Department of Justice. Having been accredited by them will increase sales and even the general reputation of the brand.
The second reason is that their reputation is on the line and one bad safe may destroy the reputation of all the other more expensive safes that have been created by the company. Therefore, some companies choose to take a smaller profit margin to help them improve sales and even get their name out there. This is a huge advantage that consumers do not take advantage of and you may be missing out on spectacular bargains.