Huge files generally have fewer seeds/peers. You can end up with milti-GB files sitting on your drive for a long time while awaiting the last few MBs. I have a 5-GB file that I have waited months to complete. And if the files are archived, you may not be able to tell if you got a good copy until the download is complete. Would it not suck to find out, 14 days from now, that your file is mis-named, poorly ripped, or spam?