This is a great idea. I want to do this on my own forum (in the "Content" areas, which really reward community participation). In order for this to work you need:
1. Custom Profile Fields (not a big deal, built in)
2. Some way to randomize a value (in a template?)
3. Conditional to use one value (user's adsense id) or another (site's) based on random value
Shouldn't be hard.
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