You are looking for extremes, whereas I am merely looking at it from the average behavior of wealthy people.
If there is a large wealth inequality that means that the relatively poor will simply have a smaller piece of the cake and the wealthy growing their wealth will have a larger impact on the poor, percentage-wise. Now, if that growth is only due to hard work, then you can't really argue against that; however, if that growth is partially due to "wealth abuse", then that's a different matter.
Sure, your very unlikely to ever encounter such a situation… But any given wealthy person you encounter in life is also very unlikely to be so malicious?
Even perfect equals can wreck each other’s lives completely, in legal ways too, if they commit their all to it.