I don't think it’s as simple as one might think to just "place a link" outside the fold of sorts when you are talking about something as complex as the G page and integration of ad placement for search terms. Having battled many mammoth apps in my day (oh the days), the path of least resistance often wins. They have a really good system with adwords for the placement of marketing ads to offset where a page does not get organic rank, so it makes sense to use it like the rest of the world. It's not driving up bid pressure if you can't get above them.
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Samflutch
buzz marketing