I think the gap however large is never a problem. It's if the influence of that concentration is allowed to subvert systems to self interest as extreme concentration of wealth tends to do then it becomes a destructive cycle for everyone else.
It doesn't matter if Bill gates or Queen Elizabeth has billions as long as everyone else is not bad off.
If everyone starts a 100m race and someone wins its fair, but this is a race where the privileged have advantages in too many ways from the time they are born and the unprivileged disadvantaged in too many ways and equality in opportunity in the context becomes nearly impossible beyond posturing and tokenism.
I'm fine with a wide wealth gap if (a) the bottom is bounded and (b) one's position on the spectrum depends more on individual merits than family lineage.
It doesn't matter if Bill gates or Queen Elizabeth has billions as long as everyone else is not bad off.
If everyone starts a 100m race and someone wins its fair, but this is a race where the privileged have advantages in too many ways from the time they are born and the unprivileged disadvantaged in too many ways and equality in opportunity in the context becomes nearly impossible beyond posturing and tokenism.