~snip~
Casinos are business centers, casinos run smoothly because of the revenue they generate for the operational cost, and this revenue comes from the gambler's losses, anytime a player wins against the house it means the casino is losing, but anytime the players lose the casino make profits, so the house edge mechanism is designed to protect the interest and ever winning advantage of the casinos over the players.
There is no way a player can become rich through gambling unless by chance or a jackpot/lottery, aside from that, as long as you keep playing, you will lose to the house.
Yes, except for the very lucky few ones that actually win big, let's say a big jackpot.
Those people actually might be in a position in which they have won more money than what they have put in the casino.
But of course the casino is usually quick to invite them for free drinks and snacks, to keep them gambling until they lose it all again.