Or may be the police doesn't bother about the money lost. In most scenarios, such cases are handled by the cyber crime department.
The cyber crime department are often too busy handling cases which include thousands of dollars and are less bothered about cases where low amount of money is lost.

Another reason is that sometimes the police are not able to do much in cases where cryptocurrencies are involved.

Due to these reasons the scammers get away with such scams easily and end up collecting huge sums of money.