I actually did some experimenting where I pointed my adwords traffic to a one-page gateway (http://www.import-duty.com) and then switched to a more content driven website (http://www.itintl.com). Google immediately upcharged the gateway page 800% more than the content site. I saw from the logs what looked like a manual review of the sites and the increase in minimum bids came immediately after. The upside is that after switching my ads away from the content site and back again, I triggered another manual review and they lowered the minimum bids on http://www.itintl.com