Yes, if it is just a dead button there, people can just use a bot or an auto clicker, what you can do is make the button spawn randomly instead, and if you want you can make ads spawn randomly around the page too, so if a user tries to bot it he might accidentally click on the ad and loses the game.
If you really want to make this, you really have to go through lots of beta and to make sure it cannot be 'bot - ted' . I would say not many would deposit to play this game, because there is really not much point in this. Perhaps you can make it free for all instead, like a faucet, profit driven by ads.