Sometimes when someone is already in front of the gambling table, they immediately forget everything, especially if the person has poor control when gambling, this can allow him to lose more money in just one sitting in front of the gambling table.
That is true and also completely ironic, because we all as gamblers we only have control on very few things when comes to gambling and bankroll is one of them, so obviously we should not give up on that control for the sake of adrenaline or because we desire to get as much money as possible or chase losses which we may never get back.
The founding stone of bankroll management is the bankroll itself, one needs to set aside a fixed amount of money in order to gamble with it and not to touch money witch is intended to pay for our living, starting from that point, we can plan when we are supposed to double, to halve or to retreat from the casino.
Someone who does not manage their money accordingly will see their gambling session time reduced and their losses accumulating faster than they desired.