@temba If sitters would all set their preferred countries I think it would also help narrow down those searches. In your example, a person living in the UK who is only interested in sits in mainland Europe would, I think, not show on that search. That would also help owners, as well as avoid sitters getting invites to countries that are of no interest to them.
Update: Please see the next post. Chances are my theory here is not correct. My apologies. 