Why would anyone NOT want to know how to get out of a spin?
I think most of your average pilots would like to know how not to get into one in the first place. A spin by it's nature is an unusual attitude. To get yourself into one in the first place requires some unusual handling. The average pilot flying the average spam can does not get themselves into unusual attitudes in this manner by accident. I can't remember in the last 3000hrs flying along straight and level and the aircraft suddenly departing into a spin. The spin related accidents we see are either aerobatics gone wrong which we don't teach at PPL either or the usual stall spin on final/departure which spin recovery training will not help with. Therefore, I think spin avoidance training should be concentrated on at basic level and those who want more advanced skills then have the option post PPL to gain further experience at places like Ultimate High.
I think sticking to the mentality of 'I had to do it and it did me no harm' is one of the reasons why GA training is so stuck in the mud.