Awww, shucks! I try to be as helpful as possible (although sometimes my knowledge fails me :3). As far as I know, sending something through the compressorizer a second time shouldn’t have any effect on it. I ran my entire downloads folder through the compressorizer about a week ago, and there were definitely files in there that the original creator had already compressed. Those files just remained the same size. 🙂 However, I have heard reports of some Simmers experiencing issues with their game after running their entire downloads folder through the compressorizer, so I’d recommend making backups of your cc before trying it! 🙂
My downloads folder went from 13 GB to 8.6 GB, which seems impressive but I haven’t noticed any difference in load times or anything. 😛