I no longer pick people up from the airport either. As has been mentioned I would get them to get the tram into York Place, which is the terminus, or another stop en route, depending which part of the city you are coming from. If its York Place you can get them to go down to the top of Broughton Street a few yards away where it's easy to sit in your car for a few minutes, which is not possible on York Place. Edinburgh is a nightmare with traffic works all over the place and getting to the airport is grim in any case. If they are well off just ask them to get a taxi and you'll be relaxed and ready for your guests. Yes...you get charged just for your wheels to use their tarmac for a minute!!