Often, when a woman is raped, the public will accuse her of lying, saying she is trying to "get money" How?

Since rape victims are usually accused of lying and making up the attack to "get money", I was wondering, how to rape victims get money from being attacked? I've never heard of a rape victim becoming rich from an attack. In fact, in every case I have heard of, the rape victim usually is destroyed by the attacker's lawyer. This has always puzzled me.