I have no desire, nor was it my intent, to convince you to watch K-ON so I won't get into that. My issue is with your initial perception of the show that you posted, which happens to include a number of huge pet peeves of mine when it comes to criticisms of anime.
The reason why I think your assessment is unfair is because instead of evaluating the show on its own merits (whether it's concept or style or whatever), you're judging it against something external to the show. Instead of saying "I don't like this show because it a show about high school girls forming a band doesn't interest me", you're saying "I don't like this show because a show about high school girls forming a band seems like a cheap marketing ploy and, thus, offends my notions of art."
But if, as you say, it's all cool as long as the result is good, then whether or not the marketing/business/whatever affects the show is something that you shouldn't be able to judge until you've seen at least some of it. Otherwise, you're just saying "it looks like x and is about y, therefore, it is a cheap ploy".
Also, when I noted that most anime panders to some segment of otaku, I meant exactly that. Late-night anime is almost exclusively created to pander specifically to slobbering otaku and not normal people. The only question is which slice of the slobbering otaku market they're going for. Is it the moe crowd? The mecha crowd? Those sakuga guys? Seiyuu/idol obsessers? Visual novel readers?
There is this misconception that normal people watch good anime; this is untrue—normal people do not watch anime. When I think about it like that, it's another reason why this concept of anime pandering disappears as a relevant or useful metric.