I think that there is more of a filter for BMR'd sites. It sounds like you guys are saying that there is no penalty for being linked to from the BMR network, simply a loss of rank due to lost links. I have to say though in my experience ive lost more than the link strength I got from BMR - a HELL OF A LOT MORE. Ive been utterly smashed and hammered - not just lost links.
Im saying this because my rankings should drop by a page or so - in some cases I had so few BMR links to a site (say 4 rubbish ones like PR1) that my site should not even had moved if these links were lost. Infact the site was demolished - slashed out of the top 500.
So I am suspecting a penalty ON TOP of the loss of link juice because I havent used any other BH things on the sites.