1) The reason he stabbed his 'friend' was because he betrayed him and stole something of value. Suppose it was treasured keepsake with no real monetary value; it would still be worth something to him. An assault over a verbal insult would be less explainable than this.
2) Do you have a bank account or a credit card? In both of these cases all you have are numbers stored in a computer somewhere, and they only refer to the physical world through a worth people agree on. In this same way the sword equated to labor someone did in the game, which was just converted into another form of currency when it was sold.
People who think the sword was worthless think so because they do not see it as being worth time or effort to acquire. I do not think this is fair; what if someone reported that their store of lutefisk was stolen and sold for a profit, but the police dismissed the theft because they personally saw lutefisk as being disgusting and worthless as a food?
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