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There is no way that the Western Force can make a "profit" in 2018 as Minderoo is paying full costs for all of the exhibition games.
Things MAY change with the full 8-team World Series Rugby competition in 2019 with 7 x home-and-away + Finals competition.
However, it will take a couple of seasons to test the model and be talking about "profit".
Perhaps Minderoo will end up running the WSR competition so that the Western Force can be privately/consortium owned and be run as a separate profit-making business - which all of the WSR clubs need to be ASAP.