If you are Linkletter and Young level you go pro. BYU can't give much in terms of a scholarship money.
Most of the BYU runners get partials for their running. 12 scholarships he has to divy up between 20-30 runners. Women get 18, so it's a little easier.
Running programs and the athletes don't get much. So why transfer as a graduate senior when it would be wiser to go pro with Nike or Brooks and get your training at least covered and going pro isn't like gping in the NBA.