I guess every one has different motivations, personally for me the Camino is not a race to be done in the shortest time possible, it is something to be savoured.
I frequently take part in the Oxfam trailwalk, an all terrain 100km walk - it is a race, but for most of us its just about finishing. It normally takes me about 24 hours to complete. It is an organised international event, and we choreograph each stage exactly, train very comprehensively, plan exact food/drink intake, and need an awesome support crew and two vehicles. I cant do it every year because the training prior to the event is really antisocial, and my husband would refuse to be my support person if I did it annually. (the rest of my family have already refused) Towards the end of the training I cant even train with my dogs, as they cant walk that long. It is a challenge - half of it is walked in the dark with head lamps, so scenery and surroundings are not even always visible. I have walked it in sun, wind, and in freezing cold sleet. Its always about the finishing - counting down the km markers (unless someone has stolen them) until the final one. We go through the finishing chute, and go back for a shower and bed.
I have also walked the Camino, and will do again (hopefully again and again until I'm too old). There is no comparison at all with an Oxfam event. I do a Camino for many, many reasons - personal, spiritual, and social. Although I always hope to get to Santiago, it's about each day of walking, not the getting there. It is almost the opposite of a race.
Last time we did some 25-35 km days, our longest was 41kms. Next time I aim for 20-25 kms, maybe even less. I want more time to smell the roses, to chat, to soak up the history, go to more church services, eat, drink vino, enjoy every single minute - to stretch the experience out, and eke out every piece of happiness I can. I know that as soon as I reach Santiago I will want to walk again.
It takes a long time to reach Spain from NZ, I want to take my time and enjoy every moment.
To me the Camino is not a race, but an life enhancing experience, that helps me to be a better me.