Currently, all our exporters set Selection Only to False by default. In my experience, I pretty much always want this enabled, and often forget to set this.
According to many users that I've seen, they seem to say the same thing. Due to overwhelming requests, here's a patch to enable Selection Only for all the built-in exporters
This patch is against the 'addons' git. The Collada exporter is in the 'blender' git, and so must have a different patch, here: