Considering the warning signs it is pretty amazing so many people lost their money. The withdrawal limits on Mt. Cox were a glaring red flag. Legitimate organizations don't have "withdrawal limits". What if you went to your bank and they said, sorry you can only withdraw $1000 this week. When you see a withdrawal limit that is usually the precursor to coming back "next week" and finding a lock on the door.
Well that's not entirely true. If you want to withdraw a large sum of money from your bank account, depending on the size of the withdraw you may have to come back a different day.
See this:
http://www.bankingquestions.com/savingsaccounts/q_cashlimits.html