Demographic advertising is good in google adwords. It is a bit expensive but the results are extraordinary.
Yes even I have come to know of its good results .It is a little costly but it will prove to be less costly eventually .
yes man, you will need to pay much higher with adword if you target demography but of course, the result is really great.
By demographic advertising I mean regional advertising. There are some affiliate programs, cashcrate.com that allows members from the US and Canada alone to earn by completing offers, this type of demographic advertising will be useful in recruiting members from those countries.
I've had luck using some words like "football, sports, poker, etc" on the content network with cheap bids. The objective was to target 20-30 males....some cheap conversions can be found sometimes!
You are right. Specially in the US with the huge market. Certain area are much more populated than the others. The CPC cost is lower in denser area, while the cost is higher is less populated area. If you can group the ads into different according to population you can save yourself a lot in long run.