It's safe to say it's for entertainment only, winning and gaining more is just like a personal aim, it would vary from person to person.
Some would just want pure entertainment and they are ready to lose their money as they can afford to lose it.
Apply the rules to yourself that gambling is only part of pure entertainment, so don't worry if you lose money to enjoy entertainment. Don't get caught up in gambling because it will be very difficult for you to find a way out for a better life.
I know that as I am a gambler myself and a discipline gambler to be exact.
I understand the risk and i know how to have fun with gambling, I've been doing this for years and it just makes me more matured that I would not not likely make stupid mistakes in gambling.