How does the Aruba Scambio Banner service work

The Aruba Scambio Banner service allows you to advertise your own web site free of charge by the uploading your own banner to the web sites of others subscribed to the circuit. Vice versa, the banners of other users must be hosted on your own web site, in order to acquire credits.
At the moment of registration will offer you 300 credits: every time that your web site hosts another users banner you will gain 2/3 of a credit; while every time your own banner is shown on the web sites of other users entered in the circuit you will spend 1 credit. Therefore the system exchanges with a ratio of 2:3.