Looking North from the antipodes it seems that ATCOs and FS in the European area are lucky to get famil flights - we were interested in getting "across the ditch" to visit a neighboring centre and sought to do it by way of a famil flight (2 birds with one stone sort of thing) - reaction from the airline approached was "if you need to make the visit then you need to pay for a seat". So we don't go on many cockpit famils.
Also don't get many visits from aircrew. I recall one in the last year, and our centre is located on the airfield, next to the aircrew long term carpark! Sadly not a lot of interest being shown.