There's a fairly simple way to make gold without professions: Sell summons to a pick-pocketable Hagara to rogues looking to get their legendary quest starter daggers, Vengeance and Fear. These are the most accessible rogue weapons, because aside from picking the pocket of the fourth boss in a raid instance, the quest can be easily completed with a 10k gold and a minimum amount of help. These daggers are the best entry-level options for rogues who PvP or PvE, available as soon as they hit 85 and are capable of completing the quest.
If players are raiders, they'll probably get it for free just by being in a raid that gets to Hagara; however, if all they do is PvP or casual PvE through the Raid and Dungeon Finders, they won't be able to get the first leg of the quest finished. Within a few weeks, most rogues who want to start the quest will have started it. Until then, I've heard of non-raiding rogues paying as much as 25k for the opportunity to pick Hagara's pockets.