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(1) I am looking for something to help me manage ads and can deliver uniques/pageviews metrics to advertisers. I know there are things like Google AdManager, but are there companies that collect $$$/account information from both parties and actually broker the transaction? If so, any names, and knowledge of percentages/fees?
(2) My niche has a rare opportunity for successful flat-rate advertising. I know this is not the most competitive strategy but it works VERY well in my niche and I might like to entice early advertisers with flat rates. Do most ad managers accommodate this or is it always CPC/CPM? (That's what I was seeing.)
(3) What has been your experience with ad managers? I read on WebmasterWorld that people found AdManager useful but prefer the human element for advice/question/pricing/etc. What to watch out for? Pros/Cons? Any anecdotes etc. are VERY welcome.
Have a look at Google Ad Manager, Trafficspaces, OpenX etc
(2) My niche has a rare opportunity for successful flat-rate advertising...Do most ad managers accommodate this...
A good ad manager should be agnostic of the payment model. Get one that gives you CPM, CPC, Flat rate, and the holy grail - bidding
I assume you've already searched Google for "self service ad managers"
Big drawback: Upon testing the waters with the free version, I saw a referral from an analtytics program based in Nigeria. They could be legit, but Nigeria scares me. The referral is probably me checking what the ads look like through my given url...but..
It also appears Alex Cole (profile) may be affiliated. Care to comment Alex?