Surely, you must know that if you have a lead on your list, they are also on several other marketers' lists as well! Think about how many promotional emails your average lead gets on a daily basis. The more list a person is on, and the more emails they get, the less responsive to emails they become. This is called list fatigue! Sure, there is a lot you can do to stand out, but everyone else is doing something similar to stand out as well. This makes email open rates very low and can decrease your conversions. Added to that, as more people have entered the field of affiliate marketing, the competition has become fiercer. Your audience likely receives several dozens of promotional emails every day, and it's becoming more challenging to make your message stand out. Another thing to consider is that Google’s Gmail is the largest free email service provider, with over 60% of the market. If you have a Gmail email address, you know that Google buckets incoming emails into “Primary,” “Promotional,” and “Social.” Most people rarely ever check their Promotional tab, which is most likely to be where your first promotional email to your new subscriber will end up.

Spam and Privacy Concerns: With the rise in data breaches and privacy concerns, people have become more protective of their personal information. Laws like the EU's GDPR have also made it more difficult to collect and use personal data. People are less likely to subscribe to a new email list because they're worried about spam and privacy issues. Email service providers are even more strict and are likely to send your first email to your newly added subscriber to their junk or spam folder, never to be seen. Free email service providers now have sophisticated ad-blockers and spam filters. These automated filters can prevent your emails from reaching your subscribers. If your emails are consistently going to the spam folder, you're not going to see a good return on your marketing efforts.

With the rise of social media and other forms of communication, people are not as focused on their email inboxes as they used to be. More and more people prefer to engage on forums, social media sites, membership platforms, and text messages.