Swiss used to fly to Cape Town and stood there for the day until they did the day flights. Got to JNB in the evening, turned around and flew back. Now they do the night flights again but stay in JNB. Lufthansa went to various destinations to "park" the aircraft for the day. Windhoek, Cape Town and for a while Harare. I think Cape Town would love for them to park elswhere as they havn't got to much space. Ba went to Gabarone from JNB every now and then with the one aircraft.
Its amazing to see how many pax reconnect from FRA and ZRH in the mornings. And as has been said before, it wouldnt help the pax much if the arrive in Europe at 9pm (later if the flight was delayed) and end up staying over at the airport.