one of the important elements that must be owned by a payment instrument is that its value must be stable, and I don't think bitcoin has that yet. The price is very volatile in the market and this can cause losses for merchants who receive payments on a small scale. But fluctuations are also an attraction for investors to involve in bitcoin investment.
Fluctuations are also favored by merchants who have the courage to make payments with the BTC method,have you ever seen in the newspaper about pizza merchants coffee clothes or car musical instruments and others that have been successful through BTC.a merchants can also be said to be an investor well in my opinion BTC is very suitable for payment dude.