I think we all seem to evolve as we have our experience across the site; as we exchange ideas and thoughts with one another, compare our opinions about this issue or that, concede to someone who makes a valid point in an opinion contrary to our own, we learn and grow, and the challenges have extremely broadened this aspect of the site. We learn from each another's posts just what can be thought up, we learn about ourselves, surprising ourselves in just what we are capable of when the chips hit the table. I know I have, and I'm sure you will too, Springs. I now can't remember how the challenges started up, but I was a firm supporter in starting them, simply because beyond the entertainment value of participating, I was wanting to learn what the writing styles of others were like, how each individual quirk of their personalities could differently interpret a single theme or genre, and more importantly, see how deeply my own thoughts go, what I am or am not capable of in fields I felt previously weak in. (Humor, for instance; a win came about because of a quirky little twist at the end of one of my entries.)
So just don't consider the challenges as something to overcome so you can boast about it. They are, I believe, a great learning tool in many different effects; they're even good studies of psychological profiles of each entrant, if you can decipher enough out of the entries, especially, it seems, with Halloween month's theme.