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Since I've never played the game, I'm not concerned about the fishing part. It's the sudden appearance of a 220,000 gold item in the game that bothers me. Unless everyone is also required to sink that 220,000 into consumable supplies later, this pretty much signals the end of the game's economy.
While it is true you can fish from the shore in Velia I do believe you get better catch on the islands. Making a fishing boat is actually quite easy if you have a few workers and get them to gather the resources and craft it in Altanova .
I don't know how that guy got so many shards. I saw one very rarely. Maybe it has to do with the exact spot he was fishing from? Do fishing boats matter? He could have taken a raft out to that island and fished from the island.
So this kind of answers my question about the game economy then... and not in a good way, I'm afraid