Not only is it cheaper but it also works better. When you lift your truck the distance from the pitman arm to the steering arm will be increased, right? what this does is increase the operating angles of the drag link, now you can add one of those fancy s shaped ones but you are not really correcting anything with those. The forces will still be transfered from Point A the, Pitman arm, and point B the steering arm in a straight line from A to B, no matter what shape the actual link is in. What you want to do to keep Turning radii the same and keep bump steer to a minimum is to keep the ends of the two arms as close, up and down, as possible, and keep the angel of the line connecting them as close to flat as possible, that is why a crossover setup is so effective, the drag link becomes a lot longer and the angles decrease. By getting the raised arm the slope of the drag link becomes flatter and is a better fix, a dropped pitman would also do basically the same thing , but the arms are cheaper than the pitmans and you get more correction for your money.
RaisedK5
"Friends don't let friends drive Fords"