Interesting. A good friend of mine has a LLB from the UK and practiced malpractice defense in the UK for about 10 years. She and her husband then moved to Seattle. Her UK degree and experience made her eligible to sit for the Washington Bar. She took a Bar exam course, passed it the first try and was admitted to practice in Washington. The juries absolutely loved her British accent and I am convinced that this helped sway some juries to her side.
There's no question that juries love accents! There aren't any civil juries here, so it's hard to gauge in dollar terms what that would amount to.
In this country there's no state to state barrier to practice. It's one of the things they find most bizarre about our system.