If you want to mine at home, it depends on the hardware. I just posted this
AMD vs Nvidia review yesterday, comparing a couple GPUs:
The 7870 does a decent job of mining... I don't know what all the rates are, so I just used this conversion calculator. According to it, mining with the Radeon 24/7 would bring in 1.45 BTC per month, worth about $62 USD a month.
Looking at the power consumption then:
It depends on the power cost of your country. For me in HK, it would cost about $17 a month to do, which is a net profit of $45 a month. In BC it would only cost about $8 a month to mine 24/7.
There is certainly more efficient hardware out there, which would be more profitable to run, but then you have to factor in the cost of the hardware itself.
IMO if you have a high end Radeon card, it might be worth mining a bit just to recover the cost of the card itself
