And smart boys are not interested in sluts. The trouble is, they are having to search farther and wider to find girls who aren't. The girls have devalued themselves enormously.
In my experience the smart and decent boys are taken and skinned; exploited, by the girls in high school and undergraduate.
There are precious few good young people; now more (or less?) than ever.
Yes, they are bought cheaply. Bargain-basement girls don't get far in life. They will wake up some day in the future and wonder where the years have gone. They will look in the mirror, and an older woman will look back. Their biological clocks will be running out, and there won't be much hope in their future.
Perhaps you should compare your definition of slut with that of those you claim aren't interested. You may find some find those you think slutty quite acceptable to many marriage minded men.