I think then we'll take out the hooks because the photos we have up will be removed. I read once that people don't really associate a house with themselves, if they see other people's lives in them. Don't know how much truth to that there is, but the other thing is given there are particular people we know who will attempt to come to an open for inspection, we don't want pics floating around anyway :/
I see what you're saying re family pics, etc, but could you borrow/freecycle/hire/find some tasteful, neutral, non-personal pics to replace them, rather than removing the hooks? I think pics on the wall make a place looks loved and cherished and homely, and help to create that aura of homeliness, that 'feel' that some houses have, in the same way that the smell of baking bread does, even if you never bake bread!