Elucidation needed re: rev sharing

[NCBeachBum]

Okay, I am likely going to give more info here than is needed, but I want to also lay out the process I tried to use to figure this out on my own so someone can point out any stupid errors I made in it.
I'm trying to figure out the effect of revenue sharing on a league so that the commish can present the league with some options for a possible vote, along with rough estimates of how it would effect our teams. So I have our financials, and the first thing I needed was to know which components, exactly, are shared. The manual... does not seem to say.
So I created a quick test league, set up the financials very similar to ours, but added 50% rev sharing. Simmed a season. Added up all the positive rev sharing numbers at seasons end (thinking that gives me the pool that was being shared, and that the negative numbers should equal the same amount), divided by 30 (teams), and got a result of about $13.1 million. Multiplying that by two because rev sharing is set at 50%, gets me a tad over $26 million, which I am thinking should be the average amount of the shared piece of revenue per team,
Then I figured team's local media for the first piece (sum of each team's (media rev - 40 million [the same for every team nat'l media]/30), and I get about $50 million. So even if it were only sharing 50% of the total local media in the pools, the total should be nearly twice as high.

So where is my thinking wrong here? What is shared, and what mistake did I make, if I did?

[NCBeachBum]

And I suppose I only needed to step away for a while and come back with fresh eyes to realize my mistake. Because big market teams are getting a portion of their money back as members of the pool, it would only show roughly a quarter instead of a half going to the small markets if you put 50%. Which makes the numbers work really well, as long as I can assume all that is being shared by revenue sharing is local media revenue. I would still love a confirmation of that, though.