I spend about 50 per month right now. Taking it a bit slow. It can get out of hand if you set your bids up to high, I find. Sometimes you have to though. Just to get your links in a good listing spot. And not on the 11th page of a serch lol. How much do you guys have to spend? Does it work for you? check it if you like (freetoforum.com) PM me if interested in buying (yourgameportal.com) <--cheap price for sure!
I think the actual amount of $$$s spent on AdWords is not so important, rather the ratio of AdWords costs vs Affiliate/AdSense income is what counts, right? If I spend $100 a month on AdWords and earn $45, that is not so good. But if I spend (like Trypp in another DP thread), $2000 per day (= $60k/month!!!) and earn $4000 per day, that is pretty good indeed!!! So it is not the daily or monthly AdWords expense that counts, it is what income I get for my expense, (eg Return on Investment - "ROI"). K