If I may add a contrary perspective here, I think this passage appears more clever than it actually is. For example, to draw a conclusion about oneself from this there would have to be a (false) implied equivalence between monkey reasoning and human reasoning, where a monkey may be simply ignorant of the sum and driven primarily by instinct towards a larger initial quantity, a human may have much more complex reasoning for choosing a larger up-front portion stemming from self-awareness (such as the knowledge that they may not be alive to receive the evening portion, or the knowledge that the trainer may be lying about a second handout). The fact is, they were not all the same. Time is one of the most valuable assets in this world, likewise for comfort.

If any conclusion can be drawn from this parable, it's that you really don't want to be a monkey in training.