I have worked in or observed many station ownership changes, and in most cases, the seller doesn't really care what the buyer does with the format. They usually take the money and run. A great example is WOXY-FM in Oxford, Ohio. The owners were called champions of the modern rock format, with live DJs, a deep, eclectic playlist, and an active participant in the local music and community scene. They sold to a company who put on a satellite generic active rock format.