now they are using the technique called "cooling the mark".
http://www.tau.ac.il/~algazi/mat/Goffman--Cooling.htm :
The con is said to be a good racket in the United States only because most Americans are willing, nay eager, to make easy money, and will engage in action that is less than legal in order to do so The typical play has typical phases. The potential sucker is first spotted and one member of the working team (called the outside man, steerer, or roper) arranges to make social contact with him. The confidence of the mark is won, and he is given an opportunity to invest his money in a gambling venture which he understands to have been fixed in his favor The venture, of course, is fixed, but not in his favor. The mark is permitted to win some money and then persuaded to invest more. There is an "accident" or "mistake," and the mark loses his total investment. The operators then depart in a ceremony that is called the blowoff or sting. They leave the mark but take his money. The mark is expected to go on his way, a little wiser and a lot poorer.
Sometimes, however, a mark is not quite prepared to accept his loss as a gain in experience and to say and do nothing about his venture. He may feel moved to complain to the police or to chase after the operators. In the terminology of the trade, the mark may squawk, beef, or come through. From the operators' point of view, this kind of behavior is bad for business. It gives the members of the mob a bad reputation with such police as have not. yet been fixed and with marks who have not yet been taken. In order to avoid this adverse publicity, an additional phase is sometimes added at the end of the play. It is called cooling the mark out After the blowoff has occurred, one of the operators stays with the mark and makes an effort to keep the anger of the mark within manageable and sensible proportions. The operator stays behind his team‑mates in the capacity of what might be called a cooler and exercises upon the mark the art of consolation. An attempt is made to define the situation for the mark in a way that makes it easy for him to accept the inevitable and quietly go home. The mark is given instruction in the philosophy of taking a loss.