One way I like to think about people is on a sliding scale from an asethetic preference for System 1 (commonly called left brained or intuitive) to an aesthetic preference for System 2 commonly called right brained or logical).
Yes, but I intuitively dislike "salesy" stuff and then turn on System 2, put my revulsion aside and investigate if it still may be an objectively good product. To my System 1 it feels cheezy, dishonest and so on.
Let me propose another theory. It is all about being a spergy (Asperger) autistic misanthropic (so not only low social skills but more like disliking people) nerd geek who has fuck for social life and dislikes it in general. Social life is simply not honest. You are supposed to smile at people even though you are not always glad to see them yet you must say glad to see ya, and you must ask how are you even if you don't care at all and when they ask the same you cannot give a true answer but must put up a smile and say great and so on. This disgusts people like me on a System 1 level, our System 1 is not wired for socialization and thus dislike the smell of untruth. It was very very hard for me to learn that people do not always mean everything literally they say. Often just saying things because it is expected to say those. And I did not like it one bit, I valued truth (not LW type super Bayesian truth, just expressing how you actually feel ) over kindness or conformity on a System 1 level.
And "salesy" stuff feels like all this socialization - but on steroids. For example salespeople in person act as as super-extroverted, and act like liking people very much. And advertisements feel like that too.
Note that "cheezy" is an entirely aesthetic term... this is what I'm talking about in terms of blind spots. Dishonest is not necessarily an aesthetic term... but in the sense you're using it, it does seem to be more a value judgement than an evaluation that means "advertisements are lies because they tell you things that aren't true."
I agree with the rest of your analysis - one of the things I almost wrote about in my original answer is the relation between your aesthetic preferences and your social skills and desire for social interaction. hat you call "spergy" I call "an aesthetic preference for system 2."
I told an intelligent, well-educated friend about Less Wrong, so she googled, and got "Less Wrong is an online community for people who want to apply the discovery of biases like the conjunction fallacy, the affect heuristic, and scope insensitivity in order to fix their own thinking." and gave up immediately because she'd never heard of the biases.
While hers might not be the best possible attitude, I can't see that we win anything by driving people away with obscure language.
Possible improved introduction: "Less Wrong is a community for people who would like to think more clearly in order to improve their own and other people's lives, and to make major disasters less likely."