We've got a recruitment agency next door and I'm friendly with owner. He said to me once, just remember one thing - 'Recruitment Agencies are evil'. I think they try and get as high a margin as they can and also look to cover themselves cleverly if placement doesn't go well. Like any sector some are worse/better than others. When we recruited sub contractors a couple of years back some of the agencies where trying to add £100 onto a £250 day rate which was 40%.