Offcourse we are aware of the some features that could put the casino at advantage such as the house Edge, but even for that some gambler's are lucky win big despite the house edge that put the casino t advantage, so between the two who risk more.
House edge is an advantage a casino have, but this is not the end, alot of users is also a very good advantage, much better than the house edge, and this is because, with the house edge, a player can still win a good amount of money which the casino must pay, but if the casino have a lot of users playing there, when 3 or 4 players wins a game, rest assured that over 1000 other players lost that same game, and this way, the casino can easily pay the players that won from the money they got from the players that lost, and still have alot of money to save for other stuffs.
So, in the nutshell, casinos make more money than gamblers, casino as a business is built to make money, but on the other hand, gambling is not a source of income or making money, people only treat it as such because of the possibility of winning some money from it.