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by err_badprocrast 4787 days ago
The definitive version of that which printed vast bucketloads of internet money was the JC Shuffle.

buy ore (direct from farmers aka botters) -> prospect ore -> craft green rings (I think? been a while) -> disenchant -> sell enchanting scrolls and cut rare gems left over from prospecting

In Guild Wars 2 I found some other interesting arbitrage opportunities - for example, Mystic Coins (available from monthly and daily tasks) had very predictable price cycles due to supply spikes on the first few days when it became possible to complete the monthly task.