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Even if they are click tracking, they probably filter multiple clicks by using cookies, session IDs, IP addresses, etc.
What if the "Sandbox" is actually applied to websites that haven't had enough page hits from those using the Google toolbar? They could set an amount like 4000 page hits from at least 100 different I.P. addresses. Or, an even better evaluator would be maybe 100 unique visitors who have visited at least 3 pages. If you go over this amount, it means that people have found your website and have liked the content enough to visit many pages. Well, that's my little conspiracy theory for the day. Although you have to think, why would Google want to record this info if they are not going to use it?
I strongly suspect though that more advanced forms of click tracking & time spent on pages do in fact enter into the algorithims, as such can potentially represent the quality of a result.
I.e. if I google, click on the first result, and don't click any more, maybe they did a good job on that search.