Warehousing bullion for gold's supermarket As metal hits new highs, exchange-traded fund's $18 billion cache only grows By John Spence, MarketWatch Last update: 5:20 p.m. EST Jan. 11 Imagine being forced to buy gold in such quantities that you run out of adequate space to warehouse all of it. <img src=http://www.marketwatch.com/News/Story/Image.aspx?Guid=378d71cafdcf46f9969bd94847b8bbca&Track=201> <a href="http://www.marketwatch.com/news/story/surging-gold-etf-holds-more/story.aspx?guid=%7B378D71CA%2DFDCF%2D46F9%2D969B%2DD94847B8BBCA" target="_blank">http://www.marketwatch.com/news/story/surging-gold-etf-holds-more/story.aspx?guid=%7B378D71CA%2DFDCF%2D46F9%2D969B%2DD94847B8BBCA</a>%7D