What you said is also true that a good principle is not to ask anyone to pay for the gambling we play. Using our own money and our own risk is better than looking for risks with other people's money that we don't know whether there will be problems or not in the future, it's best to avoid anyone who want to finance the gambling we do or we finance other people's gambling. If you don't have money, don't gamble.
People who go to others to finance their gambling bets must have known them one way or the other and usually they are people who are friends that gamble together and that is the reason they approach them for such. It is not bad to ask someone to finance your bet, in fact that could be a business because there is always a sharing formula for it as there is also someone bringing the knowledge and another person providing the money to finance the idea that is known as the prediction or stake.