This is so fucking ignorant I don't know where to begin.
People that bring home more than $250k probably don't put money into the stock market or anything to allow new businesses to be formed. They probably don't directly fund startups that create jobs.
People that make $250k or more do *not* hoard it, or spend tons on trips overseas and fancy foreign vehicles in my experience. I run a software development shop and I've seen those people join together to provide funding to help a startup form. They do this in the hope that they can make more money later, and leave a legacy for their children. They do this at great risk (most startups fail). If you curtail the possible reward, they will *absolutely* do less of this - there's more guaranteed benefit from hoarding their money than there is from reinvesting it at that point.
I can't get on the internets without getting furious at people these days. I worked my ass off (far greater than 80 hour weeks much of the time) to get where I am today, which is only just barely getting close to your magical rich man line, from making $18k/year or so at the beginning of my career. I now employ 14 people that make on average $60k/year. If I had known that people that make $250k/year would be bad mouthed by the time I got here I wouldn't have fucking done it, and those 14 people would be without a job (or at least without as good of a job as I provide them). My services wouldn't have helped some 70 people start the businesses they wanted to start.
A market is a complex beast. People need to stop acting like they can control it. A family of 4 earning $1M EARNED A FUCKING MILLION DOLLARS THAT YEAR and there's no reason they should have $750k of it taken from them just because they did well. You're encouraging people to not try to do that well. Don't you understand that? If the nation continues down this path then earners WILL take their businesses elsewhere, and you'll be left with a bunch of people dependent on government, and no one to tax.
Fucking hippies. :)