Well, I think you
should "throw it out" (and I am saying that in a friendly way, in case that doesn't come across with a 'smiley')
I seriously don't see what it adds to the discussion. Not only do I think you can't even come close to attribute X% to luck at $Y income, I think it is unfair to paint a group with a broad brush.
As a counterpoint (which I really don't care to make, as I think it is pointless), I could easily say that many lower and middle income employees are the 'lucky ones'. Some of them (I want to avoid the broad brush) come in, don't do much more than warm a stool for 8 hours, and leave work with
zero responsibilities in their off-time. Yet, they might be making 1/2 or 1/3 the income of some hard-working, aggressive, ladder-climbing middle manager who takes work home, gets calls at night, weekends, vacations, etc. I think that middle manager is
easily working 2-3x 'harder', and probably had to put in a lot more hard work to get there (education, time, experience, etc).
Sorry, it just seems pointless to me to try to make any determination of how hard someone works or how lucky they were (lucky to be born to wealthy parents, lucky to have the body of a pro-athlete or super-model, lots of kinds of luck), let alone assign that to a group. I think it is a slap in the face to those who worked their way up (and I'll admit to having a good share of some things we could call 'luck', but it would mean nothing w/o some effort put in along the way).
To get back to the point of the OP (I had to look!), the tax code is so complex and convoluted, that I don't think one can say much at all about what one added form of taxation will or won't do. If the goal is to increase taxes on those over $200,000/$250,000, then eliminate some current deduction/credit, or just raise the marginal rate at that bracket. I don't think we need any more pages
added to the tax code, and I'm stickin' to it!
-ERD50