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Just like in a saying that money don't grow on trees meaning earning money should be acquired through hard work, that is why it is pretty hard for everybody if they keep wasting money on something that they don't really need. Gambling is really not a place to spend your money on because you could really lose a lot of money in gambling, but it is okay if you are wealthy enough to do that.
No one can be "wealthy enough" to lose money. Rich people make big bets, I mean really big ones. You can bet with 10 BTC at once on some sites, which means you can lose 100 BTC in 5 seconds. No one on Earth can easily afford
that. So, OP's words can apply to rich people as well.
On the hand, even someone poor can have fun with gambling, provided that he/she is losing within one day less they can earn in one hour with their regular job.