Why is cracking the toe knuckles more painful than cracking the finger knuckles?

Osteoarthritis. Generally speaking there is more pressure on the joints of the lower extremity than the joints on the hands. This "wear and tear" on the joints of the feet contributes to degenerative arthritis or osteoarthritis. With the obesity epidemic we are seeing even more pressure on the joints in the feet. Fortunately we have a number of treatments to address this problem.
Not as commonly done. Foot joints are not as mobile as fingers.They move in different range of motion.