How much can a Bitcoin ($) worth??

A few days ago it worthed only 5.500$, today it went over 8.300$ and it was as low as 7.800$...
According to young american people it is going to worth 190.000$!

It is hard to belive this right now, because Bitcoin is quite vulnerable right in these days.

First main fall down was SegWit2X: https://atozforex.com/news/segwit2x-hard-fork-date-postponed-reasons/

The second, it was much little, bitt you can see it was about a 10% decrease.

In Africa you can get a Bitcoin for 15.000$, in my opinion there cannot be this huge difference between two exchange rate quotation in the World at the same time.
https://www.cryptocoinsnews.com/zimbabwe-says-bitcoin-not-yet-legal/

What are your thoughts?