Absolutely wrong. What do you think? How it can be right? You should be a lucky gambler/punter to win every single bet/session. Proper money management and pure luck are the enough excuses for "winner". İf you can not earn your expenses it is called Gambling 
If our mindset with gambling is for fun and entertainment, I don't think so that gambling is 100% wrong. It may even relieve our stress and just have a good time provided that we are only using money that we can afford to lose and that we are ok even if we can't get it back again.