It is easier to take small risks in betting than to take big risks, but if you have luck in gambling, you can win big bets too.
Size of bet does not matter, it is luck what matters. If you get lucky you might win the jackpot, but are you going to continue spending money to win that till you run out of balance or use the money for something more fruitful?
But in most gambling, big gamblers always take big risks, they don't lack money because of which they can always bet more and they can be. Those who are experienced in the field of gambling are the ones who place the biggest bets because they always research and adopt advanced strategies and engage in the only bets.
Experience gamblers do not bet anymore, try to become a part of the casinos or their marketing thus making themselves a type of stakeholder in the company - they reap the profits from the casino's payroll and not lose money to the casino. The people who are making videos on youtube about casinos are rarely spending money from their own wallets anymore.