I'm a mid-level spender: I top up about 300 yuan a month.
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Gamer slang. The spending ladder runs 零氪 'free-to-play', 微氪 'light spender', 中氪 'mid-level spender', 重氪 'heavy spender' and 氪佬 'whale'. 氪 'krypton' stands for 氪金, paying real money in a game, and 中 is zhōng 'middle' here.