By registering as a user of xtownx you have access to the wide range of information available within each town.
The information contained with the xtownx mobile web site and databases is only available to registered users.
This approach of requiring users to register is the same approach taken for all other social/business networking sites since it is important to connect people and businesses, and without knowing who you are you cannot be connected to anyone.
So rather than answering the question of Why Register, it is better to answer the question of "Why should you be connected to other users and businesses?".
The answer to this should be clear - to capitalise on many opportunities for yourself and your business through networking with other businesses in your town.