With high prices I meant the margin above (or below) the standard price for the seats. So for example, if you have your bleachers at $13 per seat, it's $3 or 30% above the standard price of 10. If you have your Lower tier at $25 per seat, you're 10 dollar below the standard price. Assuming you're selling out, you can generate $13000 per week if you spend $200k on bleachers (you build 1000), or you can generate around $7100 per week if you spend that $200k on Lower tier in this case. The returns will diminish a bit if you have to lower prices to sell out, but still you get the picture.
Now it's true that bleachers are less reliable in higher divisions, so you need to adapt a bit for the future as well. But if you focus solely on Lower tier from the beginning, you're missing out on a lot of income. I'd say start out with a slight focus on bleachers while also building the others a bit, and then as soon as you think you're close to promoting, switch to Lower tier.