How do you mean address verification is fairly expensive? Expensive in terms of lost sales (i.e. users giving up in frustration due to mismatches) or something

How do you mean address verification is fairly expensive? Expensive in terms of lost sales (i.e. users giving up in frustration due to mismatches) or something else? We've had AVS in place for years and get reduced fees as a result. How many people give up on payment due to AVS mismatches, however, is another matter.