My notion for using the CC-BY-SA was simple, like anyone else, I simply wanted other people to be able to use my work, but also wanted credit for that work. After following along for a bit with the forum thread posted above, I came to a simple conclusion. I asked myself what was more important, getting credit for my work, or having my work used. It turned out to be the latter, turning me to use a CC-0 license. I think responsible people still tend to give credit, even if they are not obligated to. Conversely, irresponsible people will not give credit when they are suppose to.
Bottom line, I want people to be able to use my models for what ever project they might have and not be concerned with restrictions. I will gamble on getting or not getting credit.