Profit as in after expenses? I'm in D.III now and am probably an above average team but using my finances as a guide, I would expect the following:
$150,000 Arena and TV Revenue per week
$15,000 in Merch Revenue per week
$70,000 in Player Salary
$50,000 in Staff Salary
$20,000 in Scouting
$25,000 profit per week
$350,000 profit per season
A team can make more each season based on adjustments (less player salary, no scouting, etc.) but the bulk is going to have to come from player sales if you want to make up to $750K and assuming you want to purchase a player or two, you have to train very efficiently to realize the high purchase prices.