The fact is that the time period during which we had the 90% plus marginal rates, the effective rates were much closer to what they are now. And the tax collections as a percentage of GDP are actually equal to or greater now, versus then.
Consider this. Who benefits most from a higher marginal rate? Ironically I think it's the very people who would ostensibly be the target of those tax rates. The ultra rich simply hire an army of tax lawyers and CPA's to shelter their tax burden, while those of lesser means have no such ability. And if the ultra wealthy can't shelter enough of their income to satisfy their objective, they will simply move their wealth and/or businesses offshore. So in the end, who really pays more taxes in that scenario? I think it's worth thinking about.