There are several reasons why college coaches don't go to high school games ... first and foremost, their season is at the same time of year, and they are either playing or practicing most nights themselves. Secondly, the coaches get a lot more bang for their buck going to summer tournaments where they can see a lot of players playing all at once, and against better competition. With that being said, if a college coach does have a day off or if they finish their season early, they might just go watch a high school game to see someone who has expressed an interest in them.
But regardless of this, as gets debated on here a few times every year, it may be a red flag to a college coach if a girl isn't playing high school ball ... for the reasons bgsu stated above. You run a very fine line on being classified as a "high maintenance" player (or parent) if you tell a college coach didn't play high school because of coaches/politics/drama.