Rephrase of what I think you're trying to ask: Should a society allow any person to accumulate wealth and power in the amount that today's billionaires have?
There's a huge amount of socioeconomic theory and history behind this apparently very simple question. In general, I think there's a lot more benefit to all of us when advances do not flow entirely into the hands of a few people. Taxation has been the major form of wealth redistribution in the western world for a while now - since the Gilded Age robber-barons decided that helping society by building libraries, museums, and universities was preferable to having the government take 95% of money they made over a certain high amount.
The current system has been so perverted by that accumulation of wealth and power in the hands of a few that it's become self-reinforcing, and is backed up by educational "reform" and propaganda from end to end. The result is that while the world may be continuing to get better overall, it's either stalled, or is actively getting worse for many of us normal folks.
Without writing a novel, I think it would be a good idea to tie tax brackets to the poverty and average income levels, and then tax anything over like 100x the baseline amount at 99.98% or so. Also close all the tax loopholes like borrowing against assets being untaxed even if it's the only source of income. Try to re-balance the system for all of us, and add as much buffer as possible to keep it from being re-fucked by those dragons hoarding all the gold.