They may be fun and easy - but you have to consider the time to receive the order, drive to get the order, research the order, drive the order back to office, package the order, invoice the order, get the order to the post office or federal express, deposit payments and post receivables - those "fast and easy" document retrievals are more time consuming if you would actually note the time expended compared to other types of orders you receive and process and the service fees you receive for other types of orders.  When you think about it - it brings you back to the days where you say where did all the time go by today?