Help me out here... (we can keep this brief...)

Help me out here... (we can keep this brief...)

My attention span doesn't hold long enough to read through the hundreds of posts/replies regarding the way the NFL players are paid each year, so for me (and I would suspect others as well) could some of you guys 'in the know' and with factual info (ie- can back it up) please fill me in on the following... (Be as concise and brief as you can please...)

Things I think I know....

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Players all have salaries. (guaranteed monies)

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Within those salaries are incentives and bonuses. (Maybe you'll get them, maybe not.)

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All of the salaries are tied to the 'salary cap'.

Things I don't know....

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Are the incentives and bonuses also tied into the cap?  If not, where does that money come from?

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Where does the 57-odd percent number sharing come into this equation?  Is it from where the salary caps are derived?

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For the 2010 season, total team payrolls (All of the NFL) hovered around the 3.4 billion $ mark. [URL="http://content.usatoday.com/sportsdata/football/nfl/salaries/team"]LINK[/URL] That's a little over 1/3rd of what the NFL is supposed to be making this year, and not quite 1/2 of what I think it was last year (8 billion), and certainly not the 57% of the total revenue that keeps getting thrown around. What gives?