Things get weird when the site you refer to has multiple regional versions. I mentioned expedia a while ago and it linked to the .co.uk version for whatever reason. I have no problem with the links being added provided they work/are appropriate.
EDIT: interestingly enough, none of the skimlinks links show up while I'm on SB via my phone (not a smartphone), maybe my phone doesn't support it, I dunno. Also, now that I can see the examples in this thread, the one given by the OP is also a .co.uk link. I'm sure not all the links are for British sites, but it seems a little odd that that's all I've seen so far.