I currently run an old version of adpeeps. It's ok but I need to update this as it's no longer supported. What I like about adpeeps is there is an ad buy page, users can buy ads via paypal. My ads are pay by the month as well. They simply buy an ad banner for x$ recurring paypal subscription, upload their banner and done.
Are there any other systems out there like this? My searches are not going too well. I am thinking maybe Revive adserver (afaik formerly openx), but it would need a plugin for end users to buy ads?
Open to suggestions.
I have seen a few xenforo advertising plugins, and on the surface they sound great, but when you go into the discussions I see a lot of people with problems.