For the last 5 years, i've been racing in the ACA regional and national canoe poling competitions. It is a bit of a micro sport, but the competition provides you the ability to refine your technique against elite racers. IMHO, two of the best polers on the planet are regulars on this ACA racing circuit.
For me, the racing is only a means to an end. Certainly, if i took it more seriously, i wouldn't be racing against high end Millbrook kevlar canoes with my oil canning ABS Mad River Explorer. But if one goes into the races willing to be humbled, you get to learn what is possible from the elite racers and also the race courses (particularly slalom) force you do make moves and take lines through rapids that you would probably not otherwise do.
In the end, the poling allows one to do more challenging canoe trips, as you are often able to more efficiently travel upstream. In the days before the automobile, the canoe was not strictly a downriver craft.
marshall