When you buy traffic, you can't say anything about its quality. That is why we don't pay for traffic. Advertisers pay any amount to publishers they like and get a share of their traffic (not the absolute amount of clicks/impressions; absolute numbers don't matter).
No, it is not open source, sorry. Why would you like to look at it, what are you expecting to see there?
The stats can be delayed from a few minutes to several hours depending on the load.
Please give me ad unit ids, I will look at it.
google analytics tells that less than half of my traffic is returning visitors.
I have several your ad units on the page but the problem is the same...
In Anonymous Ads unique impression is a globally unique one, i.e. it is unique in the scope of the whole advertising network. Google Analytics counts unique impressions in the scope of your ad unit probably.
If most of your traffic comes from the site that has a-ads banner on it, it won't be counted as unique. Also if you have several ad units on the same page, only one of them will receive a unique impression when user opens you page.
It shouldn't be a problem since all publishers are in equal position and we are not pay-per-click or pay-per-impression network.