I only place a dollar value on my time when I'm working; when I'm not, I place no dollar value on my time because I don't believe in maximizing my earning potential.
I agree mostly with this. As I always say, we all have a price. So, in theory, the price of my "non-working" time is the size of the carrot waved in front of me to get my butt off the couch. This for me is always significantly higher than my "wage" at my joe job. In fact, my spouse's business (which was also mine) brought us in $30k-$40k/yr. But, we have decided that it isn't worth the hassle, as my spouse isn't good at the business side of things and on top of all the paperwork, taxes and books, I have to listen to every little detail about the business to help them make a decision. So, something that would absorb maybe 200 hours a year of time isn't worth it for that. And it would take a shift in magnitude to make me interested in doing it on my off time.
Of course, many people, who may not be as fortunate as my family, work for less in their off time than they do at their regular job.