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N.B. The official term is "filthy lucre".

The definition of "lucre" is monetary reward.

http://www.merriam-webster.com/dictionary/lucre

The most common phrase that uses the word lucre is "filthy lucre," a reference to money being something that distracts noble people from pursuing altruistic goals.

"Vulgar profiteering"

lucre is money, and crass would be one potential view on the acquiring thereof.

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