
Consider an example where after your first campaign you manage to obtain permission for future communication with a portion of the customers in your database. For your next self-initiated campaign you would ensure Spam Act permission compliance by only contacting those who have their 'opted in'.
To cut the cost of your next campaign, and to ensure a higher response rate, you may choose to only communicate with those who responded to the previous campaign.
By now you have formed a relationship with many of your customers, and could have collected some specific profiling data as well as interactive data. With each piece of specific data you collect, for example age groups, you can further refine the targeting of future campaigns.