Could you let go of your content, send it out into the world and let anyone profit or make changes from it as they will? It’s a big thing to create something, care about it and then abandon it without regret. When you give up all rights to your copy you leave your words open to be turned against you, used against you. I’ve had that happen. I’ve also had someone else claim they created my art and I’ve had someone else take my words and run them on their own sites. I think even people who believe in open content (open source for created works) might rethink things if they were taken to account for something they never said or wrote in their private journal. So, think about the open content ideal, if it seems right for you, but don’t wear blinders.
Open Content: Defining the “Open” in Open Content
The Open Content Alliance
Free Culture
Open Learn
Wikipedia: Open Content
Zen Habits: Open Source Blogging – Feel Free to Steal My Content