Many people have given gold to different NPCs when looking for unknown quests or achievements, but nothing was ever found. Remember that in test servers you can usually get free money from Testserver Assistants, this helps with this kind of testing.
The only known useful donations to an NPC are those to Simon The Beggar. By saying help, yes, yes, yes, he will take a total of 800 gold from you and give you Fibula Key in exchange for your donations.
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