They want their fictitious returns and aren't satified with their actual investment amounts.
"Some Madoff investors are up in arms about SIPC’s decision, announced by Picard at a Feb. 20 creditors’ meeting, to limit victim claims to “net equity” -- cash invested minus sums taken out. That formula ignores profit reported on customer brokerage statements for the past 20 years, gains that were fictitious because Picard found no evidence Madoff had made any trades or profits going back decades."
"In its 2004 ruling, the federal appeals court disagreed, finding customers should get back money they invested and not “artificial” returns reported in “fictitious account statements.” It adopted an argument by the U.S. Securities and Exchange Commission, which exercises oversight, that SIPC would be “unacceptably exposed” if it had to pay customers “arbitrary amounts that necessarily have no relation to reality.”
http://www.bloomberg.com/apps/news?pid=20601087&sid=agrg_Lqei7Cw&refer=home