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BTC is going up because people want to earn $$$.

Which is exactly what is preventing BTC from being adapted for it's original purpose.

Who is going to accept a currency in their shop, which can go down/up with 15% on any giving day.

Shop owners do not want to mess with that. They just want to keep their business running.

Needing to worry about the BTC market price would be a con for them rather then a pro.

I have seen at 1 btc =1100$ but now its more than 16000$

Now, imagine owning a grocery store. And deciding whenever you want to accept BTC as payment.

Do you want to worry about the market price, or do something else that actually helps your business?