Actually, that's what gamblers have to do, but sometimes the display of bonuses with large numbers makes gamblers not rational enough to consider many things, not only considering the wager requirements but also whether the casino can be trusted enough if it's a new casino, because we often see that promising deposit bonuses are new casinos to attract lots of players.
We should not underestimate your greediness and believe that we can control it. The best is prevent situation when our greediness can rise, prevention is the best. Like if you are trading using leverage and initially don't want to use leverages that can trigger forced liquidations easily. It is what we start but later after some losses or some profitable trades, we will lose our control and use higher leverages. The end is not happy for sure and the same is for gambling. Mastering our emotion, psychology and control it is key to success in trading and gambling. We must be very disciplined and trading as well as gambling responsibly.