Yeah, that is certainly true. That all the investments made in gambling is far more profitable than having to do a gambling, as the investment does not require something or need a strategy. We only provide funds to developers and afterwards they will return our money with bonuses given (profit). But we can't get an advantage in a long period of time, so we cannot expect more than a gambling investment
Maybe yes and maybe no. It depends on the situation because its a gambling you cant assure that everyday is a lucky day, you may lose if a gambler gets a win in streak or the site where you interested get hacked you may lose money in one shot too or could be also if the site you invested runs your money. So be be very careful.
If you worried that site owners might scam you then you must choose trusted sites to invest and you can find few good sites to consider in this forum. All investments come with some risks and without taking risks we can't grow our money so to reduce losses from casino investments you should diversify your money into few good casinos than in the long run you will make some good profit.