I allow myself to get attached to projects that my employer allows me to release as free/libre software---which I think is reasonable to do, since it will always be there, with or without me, with or without the company.

The medium-sized family company I work for was just purchased by another, multi-billion dollar company. After the post-acquisition stuff calms down, I'll be having that discussion with them. Until then, any work I do on the projects are void of the personal passion and extra time I put into developing and researching the projects, as much as I am able.