Three reasons :
Before I sounding too much like a car salesman. I'll explain it further.
There are numerous micropayment providers on the web. It's like a forrest with a infinite amound of tree's. Making the right decision in finding a provider that meets your needs is a tedious process. If you have a mambo website , you can simply install a component on your site and start generating revenue.which is takes only a minute.
Using proven micropayment solutions makes the process of generating revenue very save. The micropayment part is not part of the GNU license.
Customers can order services just by dailing a phonenumber on a cellphone.And you as a site admin can 'get payed' just by filling in a bankaccountnumber or a paypal email adres in the administrator panel of mambo.
Admin :Ray Koster