Foreigners put more money into American stocks and bonds in May than in any previous month...
http://www.nytimes.com/2007/07/21/business/21charts.html?_r=1&ref=business&oref=slogin
I agree,this should be the question! Now the one thing that might be an issue is the psychological issues the trader might have trading a $4K vs $40K account. The losses and commisions are a smaller % on the $40K account.