Involvement is a critical metric for several reasons. Firstly, it helps in gauging the effectiveness of your email campaigns. Emails with high open and click-through rates typically signify that your content resonates well with your audience. Secondly, ISPs (Internet Service Providers) use engagement metrics to filter spam, meaning higher involvement can improve your email deliverability. Lastly, engaged users are more likely to convert into customers, making involvement a key driver of revenue.