A newly made mud-character will only successfully fight mobiles at levels 1 or 2 or perhaps 3. There is little in the way of cost to prevent a level 1 mud-character from doing so. Practically zero since the probability of gaining a higher reward by killing higher mobiles is nearly the same. In fact it is considerable given the foregone experience points existent when one chooses to kill level 2 mobiles over say level 7 mobiles. Let us now turn to another important component of economic theory, utility.
Satisfaction equals utility in economics.
Though immeasurable, utility plays a very important role in the deductions of economic theory. For example, the theory of utility rationalizes the downward sloping demand curve. Consider your first plate of food at a local restaurant. Utility cannot be measured. But it can be conceptually considered, so let us assume that the first plate equals 100 units of satisfaction.