This is very admirable. As I mentioned in his comments, you should be writing just for the love of it -- not to seek out money from people. Of course, we all start out in this way.
But where does it end? Does having ads improve your life in any way? Mainstream print media has traditionally always sought to keep editorial and advertising separate, in order to maintain the integrity of the report. Of course, the lines are blurry in this web age.
While I haven't had the offers that Mark has, I've been wrestling with this recently. One affiliate site wanted me to go in on a 3-month deal. It sounded okay, but deep in the back of my head was a nagging thing. It was nagging enough to not have me go through with it.
I asked my friend Dorie, another full-time mainsteream media journalist -- she said she hates ads on blogs and that if she did, other people likely will too.
It was enough to delay my decision, but Mark came to the right conclusion first.