I did Naxxramas, most bosses dropped 3 items and often no set items.
Each bonus roll that does not provide loot has a progressively better chance to award loot to the player.
The limit has not changed and remains one attempt and one bonus roll per boss, per week.
If you have less than 5 charms, only spend them on normal-mode bosses that can drop best-in-slot items for you.I did Obsidian Sanctum.If you were the only one who needed that loot now you have two and will probably sell the redundant one.Each raid is wildly inconsistent with each other.April 16, lFR Wing 4 Pinnacle of Storms.

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Arthas sometimes dropped 3 set token items and other times dropped 5 weapons.Whenever you use a bonus roll and you dont get any loot, your chance of getting loot on the next roll will increase.Set items dropped rarely.The result is either gold or an item off the boss's loot table that is appropriate for their loot specialization.Many bosses that always dropped 2 set items have less loot dropping overall and drop all their items with the same frequency, meaning it is now much, much harder to collect set items.Patch.3.0 Players can now choose to receive loot for specializations other than the one that's currently active.If you expect to defeat another boss who can drop an item you do need, then you usually want to save the charms for that other boss.Limitations All Pandarian and Draenic world bosses may only have a bonus roll used against their loot table once each week.Loot specialization is available for bonus rolls, Raid Finder, Heroic Scenarios, and Mists of Pandaria quest rewards.Players who want items for an off-spec may choose in the UI which spec they would like to receive loot for from bonus rolls or quest rewards, regardless of the player's current specialization.To access the new Raid Finder clams casino in nyc wings you will need a minimum average item level (ilevel) of 480.Summary: If you have 8 or more charms and are doing enough daily quests to replace them, and don't need to save some for a normal-mode raid, you can spend them on LFR bosses that drop loot that is still an upgrade.March 12, heroic Throne of Thunder and LFR Wing 1 Last Stand of the Zandalari.It's now viable to run for transmog.I didn't check pandaria raids, siege of orgrimmar, or other LFR yet.
You certainly want to save the tokens for use on a boss that has a chance to drop loot you need.

With the release of Patch.2: The Thunder King, the vast.
If you already have all the gear from a boss (or better gear) then spending a charm will either give you gold or a redundant piece of gear to vendor.
Protection for bad luck streaks have been added to bonus rolls.