Re: WARNING: Only buy 1+ Terahash or more Bitcoin miners hardware
All generation 1 miners will be rendered unless very soon. Gen 2 will get ROI depending on WHEN YOU GET YOUR MINER compared to the rest of the queue and others competing for lower difficulty slots. It is all about when you get your ASIC miner.
I don't know about "useless". Most early gen 1's made a good ROI really fast and now they can just mine as long as BTC price > electricity. Even when electricity is > BTC price I know I will still be mining simply for the speculation on an increasing BTC price.
For example I mined on my graphics card a while back when I was technically losing money every day due to the cost of electricity. But my video card was making 0.1 BTC a day....which lucky for me I still have that saved up and if I were to sell it now, my revenue per day for those days I mined with my video card is close to $20/day, which is far greater than the electricity I paid for
