( CNN ) -- For the 300 fans who are accompanying talk show host Oprah Winfrey on what is being billed as the Ultimate Australian Adventure , the trip is a one-in-a-lifetime opportunity to take in the sights and wonders the country has to offer . But for Australia -- a country that heavily relies on tourism -- the investment is expected to pay off manifold in publicity , the government said Monday . The eight-day trip began last week and ends with two taped shows at the Sydney Opera House , which has been renamed Oprah House . Footing the bill for Oprah and her guests will collectively cost the government AUS $ 5 million , said Andrew McEvoy , managing director of Tourism Australia . But the value equivalent in exposure has already made it a smart investment , he said . `` Just before Oprah turned up into our country , the number was $ 38 million , '' McEvoy said Monday . `` So that was three or four days ago . I can imagine that to double in the time that she 's been here . And I can imagine that to treble . '' He said the number could further skyrocket next year if Oprah commits to making `` at least four hours of Oprah Winfrey television , which will go to 145 countries around the world . '' Oprah and her group have visited the Great Barrier Reef , gone on a wine-tasting excursion to Hunter Valley , taken in a scenic flight over the Australian outback , partied in the Royal Botanic Gardens and trekked up the Sydney Harbour Bridge , which adorned with a big ' O ' in her honor . `` I ca n't believe the energy of Oprah herself , her crew -- they 're phenomenal , '' McEvoy said , adding `` everyone is full of adrenaline . '' During the media mogul 's career , many have cashed in on the `` Oprah effect , '' which has launched sales of what she promotes . Oprah is in the midst of her farewell season of her show . Earlier this year , she showed her gratitude to her audience by announcing the all-expenses paid excursion . Journalist Tracey Holmes contributed to this report .
Oprah and her group are on an eight-day visit in Australia . The trip is part of Oprah's 'Project Runway' reality show which will air later this year on the OWN network. The Australian government will spend AUS $ 5 million . He says the value equivalent in exposure is at least $ 38 million .