Might be another approach to PAID TRAFFIC
http://meta.wikimedia.org/wiki/Terms_of_use/Paid_contributions_amendment
I've only seen the message they display on top of wiki now and then asking people to vote on it.
I like the idea of the non-disclosure then G can't filter it in results.
Get talking :
https://meta.wikimedia.org/wiki/Talk:Terms_of_use/Paid_contributions_amendment