The closest thing we have to market socialism right now would be worker co-ops, which do not allow massive wealth accumulation, as all wealth created would be shared equally among employees of a given firm.
(Investment would also largely be impossible, because you would not be able to own stocks in such a system. Instead, interest would have to be accumulated via financing, which is much fairer to distribution of power and prevents accumulation of wealth.)
Even Karl Marx didn't want total equality, he thought (rightly) that it was absurd.
Crucially though, the thing is that while wages are not the same, ownership is equal. Most of the wealth would be in shares of the company, not in wages, because wages are needed for consumption and because investment would be much more difficult.
Capitalism where you can't amass more personal wealth than $100M.
The only reason I would think you would need more money than that is if you wanted to push ideas that the population would not vote for.
I have much more faith in people closer to issues solving them with more good faith and efficiency than unelected billionaires being effectively philanthropic.
I would rather see more rich people relaxing with their wealth than trying to outmaneuver every last civil liberty we have for an extra dollar. Even better if they use their wealth to make their local community better. That way, there are actual human interactions between those making suggestions and voters.
Makes a good environment for natural competition as well.
Would we have a worse quality of life because of this? Important question, but my gut says no.
I'm all for civil liberties, but uber rich people can get away with weird things because they can ignore all the "no's" and essentially bribe decision makers.