It's true, I've a bit of experience on that (much less than Ron Gilbert though). Creating a game, taking the responsability of the actual result is not just a "normal" job. You sacrifice yourself for a relatively long period of time and during that your work could be considered AS your life.

You cannot lose a part of your life for someone that, in the end, would leave you with anything that a bit of glory and much frustration..

Creating a game is like a love story, and the right relationship should satisfy all the parties.