Mate, 10k lower tiers is too much..
I checked some newly promoted DI teams, with their promotion boost, they sell almost 17k bleachers at the maximum price of 20!
That means you would be losing money. You basically suppress 7k bleachers at the price of 20 which is 140k, too much for a difference in lower tiers. You would be better off selling 17k bleachers at 20, and 3k lower tiers at 70, than 10k bleachers at 20 and 10k lower tiers at some low price.
Also, so many lower tiers are slow to pay off, since you drop the percentage of the full price. What I mean is, let's say you have starting 50 courtside seats. You expand 50 at the maximum price of 200. That means you need 10 games to return the invested money. But if you have 8k lower tiers, your price is at 18, and you expand to 10k. Let's say you somehow sell them out. Since your prices are at 25% of the full price, you need 40 games to return the invested money. See what I mean?