Postage Meters were first developed in the late 1880's and early 1900's as a way to quickly post mail. Companies acquired them because they save money. With a postage meter every piece of mail is metered for the exact amount that piece goes for. Today's machines incorporate a scale and rating engine. Most include domestic and foreign rates. They also include different classes of mail. First Class, Priority Mail, Marketing Mail and others. The postage meter also allow you to add the fees for special services like Certified Mail, Registered Mail, Insurance, etc. Without a meter, one would need a scale a rate chart, and many different values of stamps to correctly meter the mail. USPS Studies from the early 2000's show that using a Postage Meter saves a company from 10% to 20%. In the past few years the USPS made an even greater change. Simply by using a meter you will save $0.05 on ever letter size piece you mail.
To Summarize why have a meter?: