I have been surprised on a tour of Northern Europe at the number of No Response hosts. Even the response ratings on the site are not a good guide, and all those folk clutter up the map. Why not take them off the map? All they do is impress how big Warmshowers is and waste the time of travellers. For the record, I host for 11 months f the year, and only travel for 2-3 weeks.
It is not difficult to respond.