Like I said, Being in D2 with a 5000 seat arena, you can virtually charge maximum price and still get all 5000 people to show up. The additional revenue you gain enables you to reinvest in your arena enabling you to gain more and more revenue.
There is no way a D4 team to charge max prices on a 5000 seat arena. Attendance will just disappear.
Why do you keep emphasising promotion bonuses? Its a one off 300k to promote into D3. That is like 1 and a half week of income in D2. You still make more being in D2 than in D4.
I've got an idea. why don't you go bot and then see if you can get an account in the US and maybe you'll see how much money you will be able to make after a season!!