It is in the nature of capital to ruin it - if users feel great about a product it implies that there is more to wring out of them. The ideal product leaves the user with nothing but the utility the product provides with no extra pleasure. If your employee loves to work for you, you're paying them too much. They can't hate to work for you (unless they have no other choice) but if they feel really good about it, that is a sign of a problem.