Anything accessible can be a triggering factor for addiction since anyone could get back easily once they have enough money to spend on gambling.
This is to bad since even if they spend few bucks on their activities but if they are consistent playing for sure they are heading into addiction. Especially if they don't have any experience dealing with this scenario nor develop already a discipline on how they can avoid getting a problem brought by addiction.
That's the reason on why casinos choose to lower down their minimum deposit requirements since they want their gambling accessible to anyone.
This happens because, in my opinion, they believe that every gamble will result in a profit, so even if they have lost, as you said, once they have enough money, they will most likely return to gambling and bet their money again. The bad thing is that they may obtain that money from sources that are not legitimate.
This really comes down to self-control. If someone has good self-control, whether they are wealthy or not, they are unlikely to withdraw the profits they have already earned. The opposite is also possible.