Hey Kevin the sites I have are dentalnews.info, discountdentaldeals.com, discountdentaldeal.com, I inherited these from a client who's check bounced and then he refused to pay so I retained ownership of the domains and the intellectual property as per my contracts anything I build I keep the rights to until paid. The sites are directory listings for dental offices, suppliers, and wholesalers. I scrape about 15 different sites daily to update these sites with new listings per state.
They don't get a ton of traffice about 100 visitor's a day and I don't market them. They have been making 10.00 per month in ad revenue. To be honest here I was not looking to do to much with them but they are seeing increased traffic since I have had them up for almost 4 years now and all the traffic is organic since I don't market them.
Given the increased traffic I figured I would see how I could get more traffic to them and see if they can make more money in ad revenue with little to no maintenance on them since things are pretty much automated. Traffic to them is about 300 user's a month where 85% are unique visitors. I honestly don't want to spend a ton of money on something that is not making a ton of money but thought I would see what ideas people had in regards to getting more traffic to them cheaply.