Why not do both? A donation of .01 and you could stuff a cookie in their browser and give them a secret link for an ad free experience. I like the idea, but like the rest of the folks here said, relevant adverts are not necessarily a bad thing. There is a reason Google is one of the richest companies in the world, because they understand this. You should too!
That said, I'm not going to knock anyone for incorporating bitcoin into their site. So, hats off to you, and I hope more sites, big or small, do the same thing.
I like that idea, but I'd rather cut out all ads to begin with and give the user a better experience. I'm still fine tuning the ideas so I'll take this into consideration though.