Adbrite keeping 95% of your Ad Revenue? WTF, y’all?

I’ve been using Adbrite for about 4 Months now, spent endless hours trying to improve my returns, and it’s plain horrible.
I’ve got about 15.000 unique visitors, with two ad zones that largely rely on network ads, and I hardly make $2/day.
What particularly enrages me right now are the statistics I’m getting for my text/banner ad zone that I’ve got at the bottom of the page. The numbers suggest that Adbrite is keeping up to 95% of the revenues it’s generating.
Here’s a couple of examples from my ad/revenue statistics for the past 30 days:
1.
Type: CPM Banner
Cost or Max Bid: $2.00
Impressions: 13.549
Earnings: $1.57
(–> Adbrite keeps 94% of the revenue)
2. CPM Banner
Cost or Max Bid: $3.00
Impressions: 8.178
Earnings: $1.76
(–> Adbrite keeps 93% of the revenue)

3. CPC Text
Cost or Max Bid: $0.07
Clicks: 10
Earnings: $0.25
(–> Adbrite keeps 64% of the revenue)
4.Type: CPC Text
Cost or Max Bid: $0.50
Clicks: 6
Earnings: $0.15
(–> Adbrite keeps 95% of the revenue)

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