1. comments aren't part of the parse tree, so I can quickly strip all comments by a quick parse print cycle. This is really helpful if you want to do automate changes to the files.
2. I can freely truncate the file at (almost) any point, and still have a valid config file. It's not obvious up front, but if your file gets snipped at some point, it's won't cause parse errors (usually) consumers of the file.