Actually, it's not that very rare because we or I can still hear some news or some stories about a gambler who already buried himself from having a mountain of debts with almost no hopes to pay it all. Loans are counted as they also see that as an option to continue their desires and continue their activity with the hopes and goal of being lucky in a single night to get free from all the debts and problems. Honestly though, there's almost no difference at all between gambling addicts and drug addicts as they both are willing to have any means just to continue their desires including robbing someone worse it's their family.
You are right that it is not very rare to see gamblers taking loans only to gamble more with the hope that they might get a lot of money at once and they will pay all the debts and will even have more left, but what usually happens is the opposite of that, and they lose the currently borrowed money as well. It barely happens that one wins in gambling after taking a loan and then successfully repaying the loan with that money.
That is why it is important to understand that taking loans for gambling or any kind of stuff that involve luck is a very bad idea you will end up building up tension and nothing else, and in the end, you will start looking for evil ways in order to get money so that you can get out of the situation you've got yourself into.
if the borrower have a plan in the mind thinking everything will go according to the plan then that is surely the most foolish thing one could believe.