If there's no shovels or no ditches that need digging then no-one can make money digging ditches. My point is that if someone makes money digging ditches, the reason they earn that money and someone else doesn't is because they're skilled at ditch-digging. However, if someone makes money from providing access to money or scarce resources they control, the reason they earn that money is not because they're particularly good at doing so but because they're the ones that own that money or those resources. (About the only saving grace of this system is that if someone's really, spectacularly incompetent they'll lose their wealth to someone that is.)
It has nothing to do with who is the "better person". You don't have to be a good person to deserve to profit from the invention of the shovel, the construction of farms, and whatever other environment you are lucky enough to be born into.
Again, these are things that whole societies receive the benefits from rather than one particular person.
Exactly. So why are you obsessively focused on one small factor and ignoring the universe of other much more significant factors? The only explanation I can think of is that you think of progress as a zero sum game and therefore you focus on the cases where X gets something rather than Y. But you are missing the forest for the trees. The world is not a zero sum game, and the important factors are the ones that lift society as a whole. You are obsessed with helping the ditch digger at the expense of the CEO and missing the fact that fact that real progress lifts everyone and that is what you should be focusing on -- how can you lift all of society further and faster.