The lesson to learn is that gambling addiction is not respecter of Gender, economic status, race, nationality, religion. It will mess you up, bring shame and disgrace to you if you don't abide by the rules of responsible and do all you can to avoid it.
At least for these two, they have a way to pay off their debts, in the case of Bruno Mars he still gets to earn $1 million per night minus his debt and taxes
How about the others who are not entertainers or actors and have no way to pay off their debts but to sell all their properties and or go to jail, gambling addiction can leave you nothing, and lose everything in one night all your properties and reputation.
The more money you have or you can make the more money you can lose and this is money that you will regret losing later in your life when you cannot earn that amount of money because you are not popular anymore.