That doesn't say much about the ad buyers, does it? They really know that little about what they're spending clients' money on?
If you are the buyer for a campaign hitting the "Top 100" markets, you likely will buy 3 to 5 deep in each (sometimes more, sometimes less). That is around 300 to 500 stations.
A buyer will first look at the stations that submitted rates that meet the CPP (Cost Per Point) goal for the buy. They will also look at clusters that have submitted several... or more... stations at a single spot rate. And if any station or market cluster has offered any "value added" such as bonus spots at night or on weekends, that "plus" will be considered.
Formats are looked at in two cases: First, if the product is not used by a particular ethnic group, then stations with a high percentage of Hispanics or Blacks may be eliminated. Or, if the product gets stronger sales among one or both of those groups, the stations with high percentages of them will be favored. Second, if the format of a station does not match the lifestyle associated with the product's marketing,
Some buys will try not to duplicate the same format on the buy; two AC's when they should really add the country station to get better reach. But in lots of cases, the format of each station is not closely looked at.
And even if a station is #1 in the agency client's target age (or gender or ethnicity) group, if it does not meet the CPP goals there is no buy. Of course, if that #1 station is part of a cluster in the same market, the station's rep may offer spots on one or more other stations to bring the CPP inline with the goal.
And the agency generally does not speak with the station at all. They buyer will reach out to the rep firm for each station or cluster and get rates and then negotiate if the rates don't meet the CPP the buy has specified.
If there is any discussion of formats and the like, it more likely is done at the media planner level. That is where the market by market buy specs are put together.
With automated buying increasing in usage, this whole process is done by computers talking to computers. The media department inputs the reach and frequency goal of the buy and the computer selects the stations to buy in each market. (Reach: total unduplicated cume that will hear the spot each week or during a flight. Frequency: the desired average number of times the average listener will hear the spot. Example: A buy wants a frequency of 10 and a reach of 60. That means they want 60% of the people in the market to hear the spot an average of 10 times,)