I'm wondering if perhaps indie gamers are too computer-literate to even bother clicking on ads. My concern is that an irrelevant, more casual/mainstream userbase might congregate around your game if you decide to advertise through banners.
Heaven forbid that people who actually
buy games cluster around your game!
Worrying that you won't be able to attract the sort of people who are into your game through banner ads can be a valid complaint if you're targeting a certain kind of geek. However, 'indie gamers' are not limited to people who built their own linux distribution. There are many people who play games, including indie games, who are not necessarily all that computer-savvy and don't have all the ads disabled. It can be the users who leave themselves vulnerable to marketing who are the easiest ones to sell to - but not always, it really depends on your game.
Don't ask for rules, here,
run your own tests. Do some advertising in different ways. See what results you turn up. Do you get engaged customers, or visitors who look briefly and pass on by to the next shiny thing? Your results are not going to be the same as mine or anyone else's because your game is not the same as mine.
Are you worrying that the "wrong people" might actually play and enjoy your game, or that they might be put off by your game because it's too hard and badmouth it around the internet, or what? You can always tune your advertising to try and make it more clear what you're offering.