Like employment recruiters they fish where the fishing is good. My kids saw quite a few recruiters from colleges near ski areas outside of Michigan. Lots of skiers in my neck of the woods and kids don’t want to give that up. Those kids also tend to play other sports and instruments and all sorts of things colleges need. They also “get” kids from our small high school and the general area every year so they swing through. Not to mention alumni in the area.
No college is staffed to do comprehensive national recruiting but I bet my last dollar if they picked up 3 kids from a high school they had never visited they might consider a stop. And of course they are going to spend proportionately more time visiting schools where they will pick up kids who might not have high need. It is a business after all and these trips cost money. I would assume any college recruiting far from their region has a plan for filling high school lower SES seats or they participate in Posse or Questbridge or some other program to deliver that piece of the next class they are assembling.