That is a pretty dismal CTR for links appearing in the middle of the page. Moreover they are the only language targeted links on the site and the CTR you get is 0,5%??
Also from previous email harvesting promos I remember that they never carried the tag over and that the onus was on affs to use a special query parameter to switch them off. Something like &emailbox=off which is a bad solution because it will only be implemented by the tiny fraction of affs who fight the non tagged holes on the reward sites. All other affs will just lose money in a big way.