Explain the details of the pigeon drop scam and why it is used so widely.

Pigeon drop is a confidence trick in which a mark or "pigeon" is persuaded to give up a sum of money in order to secure the rights to a larger sum of money, or more valuable object. ... Through various theatrics, the mark is given the opportunity to make off with the "money" without the stranger realizing
this scam preys upon the generosity, kindness and trusting nature of the victim. Here's how it works: Generally, the con artist draws the victim into the scheme by asking for assistance in catching a dishonest teller.

Basically, it’s convincing a victim or 'pigeon' to give up money in order to obtain a larger amount of money. However, it’s a scam and the scammers end up with all the money. I guess they just want money.