One important factor not mentioned is taxes. That factor alone will always keep offshore books in business. It's hard enough trying to beat the line but paying 30% taxes on top of that when using a US book, good luck with that. Especially with the amounts the OP is playing, you will for sure get a 1099 at the end of year.
I believe any profit amount over $600 is reported to IRS if playing at a US book.
I believe any profit amount over $600 is reported to IRS if playing at a US book.