I subscribed to a range of blogs and newsletters from a variety of sources. Recently, because of the sheer number of subscriptions that I have, I've starting clearing out these emails using my smartphone. There has been a trend to my behavior, and it is formulaic.
For some emails, I just hit delete, never getting past the subject line. Other emails, I skim through to the end, and still hit delete. There are a few that I'll actually click the links and read more.
Everyone will have their own criteria for hitting the delete button, and it really can be as simple as a mood factor. However, there appears to be some things that I honestly believe are person-independent.
Maybe it's time to break this right down.