Consumers make buying decisions based on the information they have. Unfortunately, much, perhaps most, of that information comes from advertising rather than objective sources. Consequently, consumers want to buy what producers tell them they want to buy.
I find it very telling that in countries where most people cycle, e.g., Netherlands, the bikes that are commonly ridden are not the same kinds of bikes that are most commonly ridden in the US, where relatively few people cycle. Where cycling is common, people view the bike as a tool. It serves a purpose and must be practical, durable, and offer utility value.
The marketing tricks that work so well on American cycling enthusiasts wouldn't work on people who view their bikes as durable tools of transportation instead of recreational toys that need to be continuously upgraded or regularly replaced lest they might have to carry an extra pound up a hill.