While the prices for the first three Tiers are understandable, I think it gets a bit extreme around Tier 4. I heard that there are sales around holidays and whatnot, but otherwise no. I'd like to suggest reduced prices for higher-up Tiers. For example, instead of +$10 as you go up, it would instead be +$5. Lowering the price could possibly help with purchases. In general, most people would probably rather buy an item for less. Using this logic, reducing prices could interest more people, resulting in more sales. It's a win-win situation in this case. Thank you for reading.