> But American industry wants 20,000 W for coast-to-coast jibber jabber?

Chicago to New York, mostly. The derivatives markets are in Chicago and the cash markets are in New York. They've been testing at only 10Kb/s, and they're probably using forward error correction, which uses more bits. (Given the application, retransmission adds too much latency, so that's out.) 20KW would reduce the error rate.