Okay Mr. Moral Arbiter

You can't purchase a belief. You can only purchase a claim. They can't buy their kid's sexuality, but you don't have to be straight to claim heterosexuality.

Neither of the two acts is a "wrong" in any legal sense, so any concept of "fraud" is off the table. There is no established set of relevant shared standards or expectations adopted by the affected individuals, so ethicality is also off the table. That just leaves morality to determine right from wrong, and morality is personally subjective: it's only a moral "wrong" if the individual perceives it to be a wrong.

Aside from situations where legally or ethically compelled to speak the truth, I think that deceiving bigots is a moral imperative. They should be lied to everywhere it is legal and ethical to lie to them.

They want to pay me to lie to them? That's a win for everyone involved.