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It is because that bitcoin price has reached a very high level, currently it is somewhere between 1750-1780 USD according to Bitstamp.
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"Bitcoin" is an arbitrary unit. It is also a very misleading arbitrary unit, because it doesn't sound like very much, but it is actually a very large quantity.
Lets look at another arbitrary unit. A "Rock" is a slang term for a quantity of U.S. dollars. If I say I have "1 Rock" it doesn't sound like very much. If I tell you that I just traded €1750 for a "Rock" it sounds like a "Rock" is at a very high level. In reality, a "Rock" is $1,000,000. If you got a "Rock" for €1750 it would be a VERY GOOD DEAL! Knowing that, would you say "To be honest, I have already sold a big part of my Rocks. It is because that Rock price has reached a very high level, currently it is somewhere between 1750-1780 USD?" Or would you wait until you could get €1000000 for the Rock.
One million dollars (a rock) can be divided into smaller parts.
For example, "1 Rock" = "1000 Grand". Another example is that "1 Grand" = "1000 dollars".
Notice this works with "Bitcoin" as well. Think of "1 Bitcoin" as slang.
For example, "1 Bitcoin" = "1000 milli-bitcoin (mBTC)". Another example is that "1 mBTC" = "1000 micro-bitcoin (μBTC)".
So you can see that "Bitcoin" is still VERY CHEAP. At 1750, you can buy 571.43 μBTC for $1
Perhaps someday in the future (when bitcoin finally does reach a very high level), you might be able to buy 1 μBTC for $1. That means that bitcoins might sill increase 571 times more than today.