Steve Richards, 56, of Tonyrefail, South Wales, could have taken a year off work after getting right the results of 12 matches for a £10 stake.
But the roofing contractor then wagered £30,000 on the Aussies being beaten in Cardiff on Saturday – only for Wales to lose 30-26.
That left Steve to say: “I’m still almost £9,000 better off.
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“I don’t regret putting on the bet because I had fun. I don’t need the money to improve my life as I’m very happy.”
And he joked: “My partner Karen wanted a pair of slippers from John Lewis – but we’ll have to leave that now.”