Even though it is not one individual racket,I don't think you can separate gambling and loansharking. I have never heard of,or been associated with any gambling operation that didn't offer customers the opportunity to continue playing just because they were broke. In addition to the game profits,you have the loan vig, plus a lot of opportunities to take over debtor's businesses,get tips on burglary and hijack scores, as well as a few other earning opportunities.