The point of ccash's post (which apparently is over your head) was that its kind of stupid buying ad time on a sports station in a market during baseball season in a market that you don't carry the local baseball teams in.
It goes something like this
Caller: I can't believe that Dish network doesn't carry SportsNet, opening day is coming up, guess I'll have to switch
Less than two minutes later
Dish Network.. 23 HD Channels, No equipment to buy* ,etc etc.
If you are buying ads on WFAN, your not going to get Non-sports fans and a majority of them are going to be either Mets or Yankees fans, who may also be NFL, Hockey, fans but are probably thinking about baseball because its the beginning of the season.
No one says they can't buy time on WFAN because they don't offer all of the Mets and Yankees game, only that its stupid during baseball season.