From the perspective of payback speed, why did boxing game machines become the "money printing machine" of arcades?

The arcade hall run by a friend bought a boxing game machine last year, and the average monthly turnover of a single device exceeded 8,000 yuan, and after deducting the cost, it paid back in 3 months. An in-depth analysis found that its user repurchase rate was as high as 65%, far exceeding traditional equipment such as dancing machines and shooting machines. Because players always want to beat their own best records, or beat their friends. Moreover, the equipment maintenance cost is low, and the failure rate is 40% less than the competition car equipment, which is a proper "cash cow" for arcade halls that want to make a quick profit!