"Back when taxes were so high, the rich were really good at tax avoidance." first, [citation needed]. Second, compared to now? Third, is it relevant? how? I see you glossed over that. It's like hacking..and painting..isn't it.
Also, capital gains tax is really. You'd have to make less than $8,500/yr to be in a lower income tax bracket. This hasn't always been the case. So, one easy, legal way to pay less in taxes is to get paid via capital gains.