My system happened to be shorting two contracts of crude oil last week. Over the weekend, I receive an email threatening to charge $0.59 per contract per day if I don't liquidate those positions in 4 days. The emails says that my worst exposure is $102,906, which in my case is for two contracts of crude oil. So I suppose IB thinks crude can rise from $57 to $108 over some weekend. The email says "Exposure will be calculated for accounts based upon open positions at the end of business on Friday, Saturday, Sunday and the Fee will be charged to accounts on Monday (Next Trading Day)." Does that mean as long as I don't hold positions over weekends, I won't ever be charged? If I sell and hold that one contract of crude for one year, I will only be charge $148 per contract for daily exposure fee. Gosh I hope I can make more than that! But to see this in different way, $148 is the equivalent of me being charged the regular commission 60 times just for holding one contract for a year. That sounds more like a sure way for IB to extract profit, even if I don't trade 60 times per year.