It's a little complicated than you think since having alt accounts is allowed and also, the forum rules state somewhere that accounts sales "are allowed"
18. Having multiple accounts and account sales are allowed, but account sales are discouraged.
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By having that clause included in the rules, it means the forum administration is keeping it's self away from moderating cases of account sales or multi accounting.
To curb this, they would have to ban multiple accounts and also institute KYC. Would you really like KYC verification here?

The bolded part show's admin stance against accounts sales in particular, we have to analyze in case by case level to avoid confusion and distractions from the main subject of arguments.