This highlights a problem with 'miners' though. Their supply far exceeds the demand. They have to consume massive resources in order to obtain the 50 BTC reward and in order to become profitable they need to sell BTC at gouged rate on the markets. The plain fact of the matter is that BTC is not worth that much, and that much power is not necessary to sustain the system.
It's expected that after the mining pool is tapped at 21,000,000 BTC that the miners will hemorrhage unnecessary miners as supply falls to meet demand levels. The current situation though is that as 'miners' pump more processing power into the pool, they will have to gouge the price of BTC to keep running at a profit.
Quite simply I don't think it's ethical to be purchasing BTC at these rates unless you have a legitimate need for them. I also speculate that this will catch up with miners, they are essentially pegging the bitcoin to the electricity and equipment involved (not unreasonable) and then throwing in as much electricity and equipment as they can get their hands on (in essence, the decentralized bank can do stupid shit too when the buyers let it.)
Welcome to the game, I have been saying this for a month now. The direct buyer at the exchange are feeding the miners fat and happy. The problem is that the direct buyer doesn't understand economics. My tip is to start reading the mining sector of this forum.
Speculation can add a lot of value. A deflationary currency assumes that over time, it's value will eventually increase far beyond it's current level. So, buyers will sacrifice additional short-term risk for the potential of long-term profit.