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It was probably the only match they bothered to promote. It also clashed with local junior and senior league as there is a lot of crossover and kids play both sports.
There was an initiative earlier on in the year the Raiders and Brumbies played on the same weekend so if you had a Brumbies ticket you could get in to the Raiders for free and vice versa. There has been similar initiatives in the past with GWS. Teams coexist in Canberra.