Final answer:
The primary reason consumers opt into e-mail permission programs is to obtain promotions and discounts. Good subject lines are key in e-mail marketing to effectively communicate content, whereas physical mail surveys may suffer from lower response rates and unclear sources of feedback.
Step-by-step explanation:
The number one reason consumers opt into e-mail permission programs is to receive promotions and discounts. Marketers often use e-mail marketing as a strategy to deliver personalized content directly to consumers, who sign up or opt-in to receive these communications. A successful e-mail marketing campaign is likely to have good subject lines that clearly indicate what the content of the email will be, which assists recipients in prioritizing and responding to emails.
However, it should be noted that data collection methods such as mail surveys have limitations. The response rate can be low and it may be unclear who is responding. In contrast, e-mail marketing allows for more precise targeting and feedback mechanisms. Subscribers typically sign up for e-mail permission programs to gain exclusive access to deals, which in turn benefits businesses through increased engagement and potential sales.