I got an email from SEDO (yes, just as the month is about to end!) saying that I was fraudulent and that my £600+ earnings for the month were "forfeit".
I assume that is code for "we're keeping it"
When I asked them to explain further, they said some of the traffic was coming from a domain sales website, and I could not list my domains for sale as that is generating invalid traffic to the parked domains.
I pointed them to their own terms and conditions:
Domain owner may not generate traffic to their domain name(s) or clicks on advertising links by any of the following methods: listings on newsgroups or discussion boards (with the exception of "domain for sale" postings), bulk emailing, ICQ postings, or chat room/IRC postings, iframes, zero pixel frames, hitbots, clickbots, spiders, CGI scripts, java-scripts, or any other similar method.
I have not yet been re-instated. Can someone tell me what I've misunderstood? My domains are listed on a showcase site and some of the traffic to the parked domains comes from there - i.e. people clicking on the domains to view them.