Thought for the day: Gold cap

I sold a Merlin's Robe for 7,500 gold today, the most expensive item I ever sold. While specific items in WoW tend to get cheaper from the moment they hit the game because they get more common with time, like Battered Hilts, and Primordial Saronite as recent examples, the overall price level and availability of gold goes up from one expansion to the next. Some items already sell for over 10k on the auction house. I wonder at which point Blizzard will either stop that inflation, or have to raise the gold cap from the current 214,748 gold.