Other stores offer credit or rewards but they leave it up to the customer to decide if they want it or not. They don't even ask. Or, a store may ask but they only ask once and happily take "no" for an answer because the employees are only required to ask once. They are not required to meet quotas.
Sears, on the other hand, takes things to a whole different level. It's borderline harassment. Nobody wants to patronize a store where they are harassed by the staff (because the jobs of the staff are on the line). The customer experience in a Sears is already off to bad start with the dated, unkempt stores, lack of selection and availability and lack of available help. The harassment at the checkouts seals the deal for a lot of people to never shop at Sears again and so, there you have it, Sears is where they are now because of these factors.