While calling a bottom in oil is proving a tricky, and costly, exercise for contrarian investors, they are undeterred. After pouring the most money into funds that track oil prices in two years last month, investors are ramping up the bet even further this month, moving cash in at twice the October pace. The four biggest U.S. exchange-traded products tied to oil had 70.5 million shares outstanding yesterday, the most since May 2013, according to exchange data compiled by Bloomberg. More than 1 million shares in the ETFs are being created on average each day this month, the result of soaring demand. The trade has gone terribly since investors first started adding to oil ETF positions at the start of October. West Texas Intermediate, the U.S. crude benchmark, has tumbled 15 percent over that time, swelling its selloff since a June peak to 28 percent […]