When I'm buying an advertising campaign, I want to know what I'm buying. I can buy 5,000 clicks or 1,000,000 pages views, and I can choose the audience, but if I don't know precisely what I'm getting, and without any guarantee on how long I'll have it, I guess your service has to be free. Forever.
"without any guarantee on how long I'll have it"
Look at the milliondollarhomepage: it has been online since 2005 and it will likely be online for the decades to come. It didn't guarantee it will be online forever, they only declared that but they still got their banner filled by advertisers! Yeah it maintained its promise because it is still online after 8-9 years, but there was no guarantee on this in 2005.
"I want to know what I'm buying"
There are a lot of professional advertising services that offer you the guarantee you get 5,000 clicks from the country you choose etc., but there is a huge difference in price.
My service has the same philosophy as the milliondollarhomepage: no guaranteed but very very cheap (actually far cheaper than MDH).
Again, the MDH got their banner filled despite they did not guarantee 5,000 clicks to advertisers, who paid even 1$ per pixel that is very costly!
If all the people think like you, why in the world they bought pixels on MDH at that crazy price?