It is very easy to simply let your website chug along and not achieve any thing. It is very easy to adapt a sloppy attitude towards your management of accumulated data.
What do you do with all the email addresses of the people who contact you? When reading the stat data of incoming traffic do you note down daily what the best incoming link you have is and at the end of the week, month, year create an holistic spreadsheet of best performing links? Both simple tasks can be a great resource for helping you to decide on the best strategy for email and newsletter campaigns.
Like any good vegetable gardener it is always an advantage to know when is the best time to harvest the fruits of your labor.