Some dungeons are also much better than other. Some take a long time to finish and some are quick. Some have few quests and others have many. The ideal dungeons have a lot of quests and are quick to finish. If you are sent to a long dungeon that you have already completed, you can leave but you won’t be able to enter a new dungeon in 30 minutes. Dungeons like the Stockade are super quick, so it will still be good XP if you are sent here more than once.
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Individual B decides to start a new character, he logs into the game and immediately begins to quest. He gets to level 4 and his bags are already full. He goes to the merchant to buy new bags but can't afford any. He sells all the junk he looted that slowed down his leveling and still doesn't have enough. As he levels to 100 he is also short on gold for other things that would make leveling easier, such as mount training.
You will need to cover very large areas in order to get a few chests as they are quite rare. Vanilla, TBC and WotLK zones work best. The way I like to do it is to park one Rogue class trial in Outland and one in Northrend, then fly over the whole continent and look for chests. One whole run might only yield 3-10 chests but you will still make a bunch of gold as you are almost guaranteed rares in chests in these zones.