Requires big money or bankroll for you to make out big base bets which is common sense but you could also potentially hit big multipliers even with just a small bankroll but of course most of the time you would be ending up on failing because you cant really be that versatile when you are just simply having small bankroll unlike when you do have huge amounts which is common sense. Luck is always be the main factor whether you are playing strategically but that wont really be assuring win or profits in the end of the day.
What you say is true because no one can guarantee you will be able to win a lot of money, no matter how much money you use to gamble. In addition to losing money, you also have the potential to lose a lot of time, especially if you end up playing gambling all day long.
If you want to keep gambling, it's better to use an amount of money that you will not regret if the money is lost due to your loss but remember, the time you spend gambling can exceed what you have set. It's better to use the time you have for other things that can benefit you.
If you don't want to lose and lose in gambling then you can choose not to gamble, or try other alternatives such as just for entertainment by using a demo account. But even if at first you only use a demo account which gives easy wins, you can be motivated to start making deposits assuming the wins you get on the demo account will continue when using real money. So, gambling itself is difficult but if you don't have the target to win big, then you also won't waste your time and you stay in control of the game.