Why do people upload CC sims/houses on the gallery?

I think people just like to get attention for the things they have made. I don't use cc and would rather it not appear in my gallery either, I've heard there are ways to get around the cc filter and that is why things are leaking through. I won't repeat them here because I don't want to give anyone ideas or encourage it. I agree it is annoying. It's also very annoying that people tag #nocc on items that clearly have cc in them :/