Sgt_Kickaxe - 2:52 am on Jun 17, 2012 (gmt 0)
In GWT when I look at the list of incoming links the same sites always appear at the top of the list because they linked to me from a widget of some sort that appears sitewide. Google lists 1000's of incoming links from said domains. I think it would be silly to hurt me on the receiving end because I don't control what they do on their site, in any way, nor will they take the time to exclude my site manually.(I asked)
I also have no way of knowing if its damaging to their site but if one of us is actually penalized I'd like to think it's them so in your case I'd monitor the sites with the links on them closely, not the site receiving them.