Outback Paul, the key airline term which causes a fare difference in a connection in the city of your travels with another segment to a different city compared to a non-stop roundtrip to the city of your travels is "hidden-city" ticketing. If you'll search on the term "hidden city ticketing", you'll find many threads which all give the same advice as the members have given here.

Because we have gotten increasing questions on this attempt to get around hidden-city ticketing, we have just added a hidden-city section to our announcement of Advice and Guidelines to Members planning to post in this TravelBuzz forum.

http://www.flyertalk.com/forum/trave...forum-445.html

I'll close the thread. But you can contact me should you wish it reopened if you have a question about this itinerary which hasn't been answered. Thanks, Ocn Vw 1K, Moderator.