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mwengler comments on Why you should consider buying Bitcoin right now (Jan 2015) if you have high risk tolerance - Less Wrong Discussion
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Your item 2 is wrong. More investment in bitcoin mining does NOT increase the rate of bitcoin creation. The "difficulty" level of mining is automatically increased to keep the creation rate of bitcoin at a predetermined constant. More investment in mining simply lowers the return (counted in bitcoin) on all previous investments in mining.
Bitcoin mining is not like gold mining. If you buy a mine with 100 ounces of gold in it, you will extract 100 ounces of gold before the mine is dead. But the amount of "bitcoin" in a bitcoin mine depends on how many other mines there are. If the investment in mining doubles, the mine you have already invested in will produce only half as many bitcoins, because the "difficulty threshold" of successful mining is constantly and automatically adjusted to keep the rate of new bitcoin creation constant.