The argument that all you need do is wait for an opportunity to sell at a higher price implies that everyone everywhere is always going to make money matter what. It also presumes that prices will always rise. Fine, if you have got infinite time, and no better use for your money. Although Bitcoin as some history in that matter, it is unlikely to remain dominant, something will come along and wipe it out. True, Bitcoin is in a unique position at the moment, but it is easily substituted, and cannot continue to increase in value indefinitely.
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ColdMonkey mines Gridcoin through generating voluntary BOINC computations for science...