Someone that is not ready to lose money should not even venture into gambling and if the person is not also ready to accept defeat from the casinos, they have to avoid going into gambling because when they get in and start chasing losses, it will lead to addiction. Losses is normal and it should be easily forgotten by gambler because if they person doesn't forget about it, it will cause some emotional problems and lead to chasing after the losses.
Yes, you are absolutely right and I strongly agree with you regarding people who go into gambling and yet can afford to withstand a lose, while knowing fully well that loses in gambling can never be totally avoided, as it is normal for every gambler, and it is how we are able to handle such scenario amicably that matters the most. Because just as O.P emphasize that the only thing that makes him happy after losing a bet, is when a wins a small amount again. And in such scenario, it only means if eventually he happens not to win after losing, then he is likely to remain sad all through. Which wasn't meant to be that way. And as such, until people like to always use an amount they can always afford to use while gambling, they will always find it difficult to enjoy gambling.