I know someone that has an asic miner, he bought it for about 1k. He tells me whatever he spends on electricity, he gets it back x3 at the current price ($100-110). He spends about $300, and gets about $1k in bitcoins a month. He participates in a mining pool where his machine is a unit of a large mining network. So right now it is somewhat profitable to mine, but as the difficulty rises, and if price stays the same or drops, it will be less and less profitable (unless the price keeps going higher of course).
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