The point of the discussion (at least my point) was that these few brokers who will deal with U.S. persons have a somewhat temporary status, since they may make the business decision at any moment, to close their business for U.S. persons.
Therefore, building a scalable and sustainable business would be at risk given the shifting sands of the few brokers still accepting U.S. persons.
Not to mention the issues involved with Funds Transfer, as you can see all of these brokers struggle with constantly changing methods of Funds transfer, as the U.S. government CFTC and such entities put pressure on the standard funds transfer mechanisms, thus forcing them to find alternative methods of transferring funds.
The result is an uncertain Business Climate, and this poses a constant Risk to building a stable and sustainable business.
 As an individual and perhaps a ‘small time’ trader (no offense meant) this may be acceptable, but as activity scales, it poses unacceptable risk and burden
[edit2] TAX AVOIDANCE IS NOT THE AIM OF AN OFFSHORE ENTITY which would be illegal. Rather, it is strictly a matter of stable access to the world’s best brokerages, and funds transfer mechanisms. WE ARE NOT HERE TO CHEAT ON TAXES !!!