Thanks boatman!

At the fundamental/theory level, I agree with the DD conflict of interest. However, on the other hand, in my (admitidly limited) experience with regulators, their (real) main purpose is to protect the industry under the guise of protecting you...

I'm really trying to get nearer to the real, practical bottom line. For exactly the same trade at the same time, why is DD worse than NDD? Is DD worse because the broker will simply give you whatever price/spread/etc. at any time that takes your money, and no matter how different from the price/spread/etc. received from the liquidity providers and that given to other DD traders and/or NDD traders at the same time?

Thanks.