Recently Matt Mullenweg was interviewed by Adriaan Pienaar about all things WordPress. Adriaan asks a good question about Movable Type:
And the second part of the question is, considering Movable Type (probably your main competitor for WordPress.org) has been commercial for so long now, is the fact that WP is Open-Source a competitive advantage?
and Matt responds, whilst slipping in a quick left jab:
Movable Type has been available cheaply or for free for a long time, and they recently announced that they’re going to open source it, but I think people will still continue to choose WordPress because it’s not about price, it’s about quality.
You’ve just got to love it.