It's late where I am and it's been long time since I've read on bitcoin (it's really not that new). But I'm pretty sure you'll find similar information if you google the subject (really research, not just a casual one)yasamoka wroteYes, but when you're making more bitcoins than what you're spending for power consumption
Think of it this way: the goal of bitcoin is to a create a new currency. Currency (or any commodity for that matter) have their value from their scarcity i.e. you can't get it for free.
The difficulty of mining is continually increasing, therefore it is very likely that any super-tweaked rig that you have will lose efficiency real fast.
My belief is that the situation at some point will reach the following, some entity will mine bitcoins at a loss, just to create the currency (like governments do now e.g. a penny costs more than a penny to make) People will revert to working for bitcoin or investing in it.
Here's a discussion that is covering both sides from what I can see https://bitcointalk.org/index.php?topic=6566.0