Before the last fall of Molten WoW, Ragnaros was the most popular WotLK realm. It comes in 2nd or 3rd now alongside Deathwing, below the leading Lordaeron. Molten WoW was renamed to Warmane. We made a site which allowed the players to buy Ragnaros gold back in December 2014. It is still in existence, though with different pricing (adjusted):

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