It is completely legal to place Adsense and Adbrite on the same page if you actually read the program policies at google.
If you are going to tell someone what they can and cant do you should also include any information to back your statements up.
Quote:
Can I place Google ads on the same page with other ads?
You're welcome to display Google ads on the same site or page as other third party advertisements provided that the formatting or colors of the third party ads is different enough from that of the Google ads. In other words, if you choose to place non-Google ads on the same site or page as Google ads, it should always be clear to the user that the ads are served by different advertising networks and that the non-Google ads have no association with Google. If the formats are naturally similar, we ask that you choose different color schemes for the competing ads.
Our intent with this policy is to be as fair to our advertisers as possible and to maintain the integrity of the AdWords and AdSense programs. You can learn more about this, and all our policies, on our program policies page.
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Here is the link:
https://www.google.com/adsense/suppo...&topic=&type=f
Personally I dont run adbrite but I do run CJ.com ads and Adsense, and I had also contacted google prior to doing so, and they replied that I well with in TOS.
The only questionable problem with any of these scripts is that google does not allow their adsense program to run from any scripts or software. Take it at what it is worth.