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argumentum ad lazarum

n. An appeal to poverty; the logical fallacy of thinking a conclusion is correct because the speaker is poor.

Wikipedia
Argumentum ad lazarum

Argumentum ad lazarum or appeal to poverty is the formal fallacy of thinking a conclusion is correct because the speaker is poor, or it is incorrect because the speaker is rich. It is named after Lazarus, a beggar in a New Testament parable who receives his reward in the afterlife.

This is popularly exploited as the statement, "Poor, but honest."

The opposite is the argumentum ad crumenam.