Argumentum ad crumenam

From Freepedia

Argumentum ad crumenam is a logical fallacy of thinking a conclusion is correct because the person making the argument is rich.

Example:

If you're so smart, why aren't you rich?

I think Mary is a good role model. She's pretty rich so she must be doing something right.

This new law is a good idea. Most of the people against it are riff-raff who make less than $20,000 a year.

This fallacy is notably prevalent in art, movie, video game, or music criticism; in the form "you can try to criticize product X but it makes millions so you don't count".

The opposite is the argumentum ad lazarum.