Two things I have observed lead me to this idea. 1. The saw of photographed raker has cut about 12 cords of firewood. In that time the cutters have been touched up twice but the raker tips have not been toughed and are still quite sharp. 2. In my magnified inspection of the surfaces indicated by the arrows I can see no file marks but I can see wear striations in line with the saw.

If you look closely at the How a Crosscut Saw Cuts drawing you can see that the trailing raker tip is dragging and deflecting the bottom of the kerf. The leading swaged raker tip tends to pull the saw into the wood and the trailing tip keeps the saw from digging in too deep. That trailing tip resits most of the externally applied down (assuming bucking from the top down) force on the saw and the down force caused by the swaged rakers.