The irreversible nature of bitcoin is great for people in third world countries like Nigeria who can't normally order via credit card online because of all the credit card fraud going on.
The lack of a discount fee should also allow merchants to set lower prices for people who pay in bitcoin.
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Great point. And it applies to a huge number of countries. Credit card companies turn down huge amounts of business because of risk. This means merchants lose business, customers don't get the goods. Bitcoin solves this.