It's possible they could've stopped it legally, however, they're already burning through approximately $1.5 million more than 2011 and 2010 just filing 10k's, etc. I would expect a greater cash burn to stop trading activity. Current expenditures approximately $5.8 million for 2012.
WMIH is a multimillion dollar company with billions in NOL's (not to mention debt/obligations). Any operating expenses in the millions is significant. Any "unnecessary" expenditures is harmful to the potential growth of the reorganized company.
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