Have any of you built BitCoin mining rigs? I am thinking about it, they only require high end GPUs with low end hardware. In 09' coins were worth change and by 11' they were worth almost $20 each! Now in 2013 they are worth over $100 each! Anyone who had a few towers with multiple GPUs in each mining 24/7 are filthy rich now with BitCoins which if you know where to spend them can buy almost anything! I see this as an extremely profitable use of a simple tower running 24/7 the way the future is headed, I can buy gold with some of the BitCoin profit. Anyone?