Why does everyone wants to predict the Bitcoin price???

Because, if you are right, you can profit a lot ;-)

Bitcoin prediction december 2018
https://steemit.com/bitcoin/@goldmine2018/bitcoin-prediction-december-2018

December 1 -3 to $ 4400
December 12 to $ 5500
December 14 to $ 6400
After that ????

Bitcoin new target $5500 > $6250
https://steemit.com/bitcoin/@goldmine2018/bitcoin-new-target-usd5500-usd6250

Today:

That's close :-)

But, as we know tomorrow everything is different, nobody can predict the future and the Bitcoin value...