Small bets are proving big business for gambling companies during the footy finals season. Photo: Dave Hunt/AAP PHOTOS

Bookmakers are in for another betting spike ahead of the NRL grand final with Australians gambling more during marquee sporting events.

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The spike during events such as the Melbourne Cup, NRL and AFL grand finals and State of Origin is mainly attributed to small bets of less than $100, according to research from the e61 Institute.

The race that stops the nation is an outlier in that there is a sharp spike in people betting and the proportion of people placing relati

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