Sources of Revenue of Soccer Teams

So I read recently that last year, every single team in the EPL was in the black. That's very impressive.



However, when you look at revenue, the disparity between the top clubs and the rest (aka the top 6 and the rest) is a little more pronounced.



I haven't looked into the particulars of the EPL's tv arrangement, but it appears that while it isn't split 100% evenly, it's pretty close. So what are the other sources of revenue that help propel the big 6 past the others?

The first things that came to mind were sponsorships, actual jersey sales, Champions League/Europa League money, stadium ticket sales (assuming there are more pricey boxes and just more seats for the big teams), and pre-season tours. What am I missing?

Also, does anyone have info that breaks down the sources of revenue for a big team by percentage. I don't know if anything beyond Champions League money is super easy to trace.