Arena purchases should be done based on time, not on volume of seats. Sure. you can purchase 2000 bleacher seats, but it takes a long time to build. Doing builds of 6 or 7 days gets your return on investment started sooner. Figure if you can sell out your bleacher seat, you are looking at about a 20 week period to get them to be a money maker. Lower tier is more profitable if you can afford it. Having 3-4 thousand lower tier seats at $19 will net you a heft sum of money. I have had my ~17k arena for about 10 seasons now and I wish I had more of the lower tier.