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The betting range in Gold of Sirens Bonus Buy spans from €0.2 to €100, accommodating both casual players and high rollers. Given the high volatility, it's wise to manage your bankroll carefully, as the game can go through long stretches without significant wins. The Bonus Buy option, while potentially costly, offers a direct route to the game's most lucrative features, which might be worth considering if you're looking to maximize your chances of hitting big wins quickly.