I tried to post on your blog, but it didn't seem to take the post, even though it saved, so...
I think all the companies are a little fidgety about anything that might even look like a break of their TOS so they don't have to pay. DH from what I've gathered here is the most fidgety of them all. I know a couple people who have been banned for whatever reason. I had thought about doing the same thing you did with some of my domains, to put links from my website, but when I asked Sedo about this, they said No. I took that to be a general rule for all PPC ones since they pretty much have the same TOS, so I didn't do it. Sorry you had to learn that lesson the hard way. They should have a way though to take out what they consider fraudelent and pay for the rest, but they don't do that which is really wrong.
I agree with yandig, the relevancy at DH sucks unless you happen to hit just the right domain. And if you try that domain somewhere else and try to move it back to DH, their system won't seem to let you do so. I had a couple domains I thought I'd experiment on at Sedo, but they bombed. I wanted to move them back, but they wouldn't take. Sedo is very targetted at least, but their click amounts are really low but CTR is pretty high. I average about 20% as a whole. I'd be doing pretty good this month if I had a better click amount, but it's better than what I was doing at DH. DS seems to be a nice cross between them.