Ask HN: Blog - roll your own or use existing

As a web developer I've generally built my own super simple blog engines for client sites - actually you couldn't really call them fully fledged blogs but they suffice.

As the need for features and content formatting increases, I wonder whether the custom built route is the right path to take. Whether I should continue re-inventing the wheel or simply use something 'out-of-the-box'

One benefit with rolling it myself is that the UI for managing the blog is stripped down and easy to use.

From what I can see though, many of the well designed company sites that have blogs use wordpress or similar.

Any thoughts?