Why Do Developers Contribute Code as Open Source?

From the 'Why We Fight' files:
There are a lot of obvious reasons, why open source makes sense. This isn't a new topic, but every so often another 'new' survey emerges that reminds us of the core fundamentals.
This time it's a new survey from the Outercurve Foundation -- which used to be known as the CodePlex Foundation - aka. the Microsoft sponsored open source foundation. But no, don't worry, no FUD mongering here, Outercurve is solidly in the open source camp.
The study found that 90 percent of their survey respondents were using open source. The top reason why? 80 percent said it saves time and money.