I'm thinking bungie would like that 10% to be higher. In matter of fact I read something the other day where the lead guy was talking about tiered raids in the future.
Raids don't have anything special for loot.
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That's because they are only challenging during the day 1 race. After that the raids fall apart so they can't just give out top tier loot for raids when you don't need to put that much effort into raiding. Most raids will take full groups at end game a few weeks to a little over a month over a few times a week.