What's Wrong With 1% Owning As Much As 99%? Marx would say it is false that the wealthiest have created the wealth, since in fact they have created the wealth with the assistance of several workers.
Another problem with this argument is that though what entrepreneurs create must be somewhat useful, or at least seemingly somewhat useful, entrepreneurs ultimately put their own profitability above the lives and personhoods of individual citizens - capitalism, in other words, may objectify the worker.
This is not to say that capitalism should be abolished - indeed, it is good for keeping check on governments - but wealth inequality at a certain level is definitely an issue.