As an event director/timer and former 2:30 guy I have a couple of observations.
First, it is not that event directors don't care about the 3:00 marathoner but why should anyone that isn't in contention for the win get priority? If you are trying to get into a race where you will be competitive, most half's and full's have an elite coordinator who can get you in. Otherwise, you are just part of the masses.
Second, most event directors (not all) do want a faster/more competitive field and often will offer prize money and travel expenses/hotel despite it not providing any added benefit to race participation. This is because we care about the competitive edge of the sport.
Third, the average participant for an event could care less about the top 10. They might be awed by a fast time, but often times they don't know the difference.
Fourth, and probably most importantly, the cost of producing an event skyrockets as the event comes closer. "Hobby Joggers" who register 9 months out allow for accurate forecasting of things like shirts, medals, advertising, permitting, police support and other things that might not matter to you or me, but matter significantly to those who participate to finish.
It isn't that we don't care about you, but there is little reason to give preferential treatment to a group that costs more and often complains more...