This is called market segmentation, it’s one of the hardest things to get right in a business, and I think Apple have done a pretty good job of it. Every decision in a business has an opportunity cost, you can’t make products that will meet the needs of everybody in a market, and you can’t try to sell products to everybody in a market. It’s hard because segmenting your market is essentially deciding that you don’t want to sell to some customers, but it’s more important to look at what each customer is worth rather than how many you can get in total.