Now the limit of good enough and as much is because if you cannot do as well coming second, then it can be taken from you. Locke’s is not a first come first serves argument. Locke indicates that man’s efforts provide 9/10 of the value of things, then this changes to 99/100, then to 999/1000, then finally the whole of value because “Nature and Earth furnish only the almost worthless materials.”
If it is true that all or almost all of the value of things are the result of human efforts and industry, then working, or getting everyone working, increases the common stock.
Government and money are the incentives to get you to labor on something in order to figure out how to make it more useful than it is in nature. Now, cultivation (such as agriculture) is somewhat different from innovation simply, as it helps nature to give you more of itself.
Locke here is pushing in the direction that taking is not always taking, but is sometimes contributing.