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Yup as more people mine (or more accurately, better mining hardware is released) the rate at which coins are released goes down. So if you are making $62 a month at 400 Mh, it might go down to $5 a month - or less - eventually. It will get to the point where for sure even the best video cards aren't worth the power cost.
BFL is about to release a bunch of hardware that is VERY cheap ($130 is the cheapest one) that will completely change mining. You WILL have to buy this kind of hardware if you want to mine.
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