I've recently had an idea for a web service that I think many people would find very useful. However, due to the nature of the service, I'm not sure I could (or even want to) get away with charging people to use it. On the other hand, I would like to monetize it if possible and I think it may eventually get a lot of traffic. So that leads me to consider putting up ads on the site.
Does anybody here have experience with advertisements as a source of income? I'm not expecting to get rich off of the revenue, or even live off of it, but it would be nice to know I could make an extra $50 a month or so (depending on traffic) just from putting some ads on the site.
Opinions? Insights? Feedback is appreciated.