I think it depends what you want to do. Does it have to be adwords? Have you considered things like affiliate buttons for services you already use? I have a page of affiliate links on my blog. They don't get hit often but every once in a while.
Since I'm "paid" then with things I'd already buy (ie. credit for art supply store, free month of web hosting, etc) it doesn't hurt to be there even if I don't have tons of traffic each month. Since it's on a separate page it isn't clutter right now. (I am intending to put it back on the main page, but I'm going to design my own buttons so everything is a consistent look)