Hmm... might be the gentleman that trained me. Retired Delta MD88, Captain with a lot of time on his hands a great love of aviation. Did not charge! He wanted sincerity not money. It was a great experience- ALL pilots should get a tailwheel signoff, you get a deeper understanding of CG relationships and using your flight surfaces to do things like negotiate serious crosswinds. I had a shallow understanding of the rudder until I got that training. You realize the way all the forces integrate into a whole in the Cub or similar a/c. If you do not get it you will not be able to keep your CG behind the mains when you take off and land, and you will ground loop. It is also a great way of learning how torque, p-factor, and slipstream affect the airplane. It's not surprising skilled pilots prefer tailwheel aircraft to tricycles.