A malfunctioning of a seal, which is normally a low cost itemcompared to the equipment costs (2.5 % - 5%), can result in multiple problems and dissatisfied customers.
This is similar to the determined shopper who knows the exact item he wants as compared to the shopper who simply wishes to look around and see what might be of interest.
A salesperson will be more motivated to knock off extra dollars on an item that has been on the sales floor for two seasons compared to something that has just arrived.