This is a problematic issue, because when you lease, the vehicle belongs to the leasing company. And it is their right to make sure that their investment is covered properly. They want  to get covered for the difference between what your auto-insurer pays and your outstanding leasing obligations at the time of the accident or  damage.

This is Guaranteed Auto Protection, and it is usually added to the leasing contract.

But you must know and be aware of the fact that you are not obliged to accept GAP insurance included as part of  your lease agreement.

You understand that shopping around and finding a company with better premims can save you money, and money is worth the effort.

The only excuse to accepting the GAP is in case they offer some extra discounts or incentives for shopping at the same company where you lease a car. If these discount and/or incentive give you a serious advantage – then go for it!