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I've only heard this by someone, but it makes sense. He said that it's good to have a complete MF gear set at high levels, because lots of events will give chests with lots of loot, and apparently MF affects them.
You can craft gear with % magic find as one of the stats on it, then you can add runes that give magic find. I was just thinking about this the other day, but it seems like you could get it quite high.