hookyI feel like if everyone played at the same time, then we'd see a drop in viewcounts for casted matches. An easy solution would be to have each div play at a different time (or combine divisions, like have Open/IM together, or div6/5).
I'd say Open/IM at 9, Main at 10, and Invite at 11. Allows players to play their matches but watch the big ones.
As your average person/player, I would not stay up until 11 on a week night to watch tf2. If it were my call invite would be at a time where people of older ages aren't still at work, and students aren't trying to sleep.
That's just a personal opinion though. I still don't watch much TF2 and i have never watched a non-invite matches in my life.