I then hiked the max cpc to $1.0. No other change was made. Suddenly the CPC shot up to $0.46. The budget was increased proportionately. But the number of clicks did not increase proportionately. The average position was 2.8.
Is there a reason for this? I mean, why did the number of visitors not rise at least "close" to proportionately of the budget? Does Google show ads on different sites (which are more expensive) and hence my ads were shown on different set of expensive sites? For a marginal increase in the average position, so much of a drop in traffic is a bit confusing...
changing your position on pages you're already on, will bump your traffic some, but not anything like it does on a search page. often though, your higher bid displaces others (especially banners) and gets your imps and clicks to move proportionately up.
so i'd say your initial bid was getting you sufficient coverage for the content / keywords you are targeting, relative to your competitors.