I do want to say, however, that there IS a very valid reason for a non-breeder to want a purebred.

If one plans to compete in certain events, such as lure coursing or agility, there are certain venues which only allow purebreds. I'm referring mainly to AKC, here. In my area, we are very lucky in that we have a few fairly active non-AKC venues. However, those non-AKC trials are few and far in between compared to AKC trials, which can be found (literally) within minutes away several times a month. AKC definitely dominates in certain sports and my next dog would surely be a rescued purebred (at least, until something drastic happens with any of the organizations).