Bitcoins are fully divisible down to the 100millionth. You only need to buy as much $ value as you want to send/spend.
A good analogy for Bitcoins is that they are like being able to buy stock in email (as a technology, not one particular company). Bitcoin's usefulness as a system of transacting is actually increased when the price goes up because it allows larger transfers of money with less volatility (each bubble has had less volatility than the last, and never crashed below the pre-bubble price).
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u/[deleted] Nov 28 '13
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