The service bays at the local tire store are always full with cars that have been parked inside overnight and are waiting to be worked on the next morning.  The scene provides visible confirmation that the enterprise is busy.  The tire store requires a high volume of traffic and therefore the approach makes sense.  If you cause is not based on volume but rather a specialized craft, does it matter if you demonstrate the amount of traffic that comes through your enterprise?  Do you need a capacity sign or does that represent a mass market approach that is against your company’s values?  Does a crowd draw future business?