It's true; right now I earn about 15 USD per month in GRC (excluding PoS interest) but spend about 50 in electricity costs. However, I do genuinely believe that the price of GRC will increase over time, so I haven't sold any of what I've gained from mining.
Also, something just doesn't feel right to me about turning off my rigs. Gridcoin is about more than money to me. My computations actually have some tangible meaning. That's what brought me to Gridcoin in the first place, the fact that I'm not just mindlessly grinding through SHA-256/etc all day until I find some arbitrary magic number.