An example:
If I obtain $5.000.000, I could gamble some small quantities just for fun (max $100) playing games like BlackJack (my favourite) and Poker, and gamble in sites like DirectBet, obviously just for fun because I would not need money for a long time (years, decades, centuries, idk) hahaha.
Cheers!
If you really had $5 million dollars then its the equailvent of gambling 1 satoshi if you own 1 BTC right now. Most likely its no fun better such small amounts. With that amount of money you can just put it in a savings account and never work.
That is why we have our preference in gambling because we have different financial status in life and we put an amount that would excite us while gambling and that we can afford to lose.